Your body warns you before a blood clot: 8 hidden signs you should never ignore

It’s estimated that between 60 000 and 100 000 people in the US die each year due to blood clots.
But despite how common it is, and despite the many medications available, there are still many people who die from blood clots. They either seek help too late – or not at all.
Of course, there are things we can do to take care of ourselves. Together we can help increase awareness – and being aware of the life-saving warning signals that your body sends out can hopefully encourage more people to seek treatment as early as possible.
A blood clot occurs when blood thickens in the blood vessels and forms a blockage. This makes it more difficult for normal blood flow to continue through the blockage – and large blood clots can lead to heart attacks or heart failure.
Often, it is not possible to explain why an individual gets a blood clot. It can also be difficult to detect because the symptoms can be mild.
Therefore, it is extra important to know the warning signals that your body sends, so that you can seek treatment ASAP. Below we have listed 8 signals that everyone should be aware of.
1. Swollen calves
Blood clots often build in the calves. This is known as deep vein thrombosis, DVT, and occurs when oxygen fails to reach vital organs. This in turn causes bad blood circulation and further calve swelling – a common symptom of blood clots.
Apart from swelling and a warm sensation, there can also be redness or discoloration when a blood clot occurs.

2. Pain or tenderness in the legs
Another common sign of DVT is pain in your legs, calves or feet.
Your calf may also feel sore or tense when you squeeze it.
3. Red stripes along your veins
If you have prominent veins and can see red stripes running alongside them, it can be a sign of a blood clot.
They can also be sore or hot, two other characteristics to look out for.

4. Chest pain
If you get a blood clot in your lungs it must be treated by a doctor as soon as possible.
An important sign to look out for is a pain that feels like a hole in one side of your chest. You may start feeling pain in your chest or back. You can also feel pressure in the centre of your chest, which can be hard to identify alongside other chest pains.
5. Difficulty breathing
Strained breathing is a symptom that should never be ignored. If you notice that you’re having trouble breathing, that your heart is racing or you have a cold sweat and feel dizzy, or even faint, it can mean that you have a blood clot in your lungs.
If you experience all of the above symptoms together, then it’s a warning sign that definitely shouldn’t be ignored. You should seek treatment from your doctor straight away.
6. Dry coughing
If you aren’t sick and find yourself coughing for no reason, you need to look out for other symptoms that could point to a blood clot in your lungs – like heart palpitations, chest pain and difficulty breathing.
In rare cases you may also cough up phlegm with traces of blood visible.
For example, during the year 2022, a seemingly innocuous dry cough evolved into a distressingly intense condition for professional footballer Hollie Olding.
The situation took a harrowing turn when it was revealed that her persistent cough was not merely an ailment but rather a symptom of a blood clot lodged within her lungs.
7. Vomiting and diarrhea
If you have a blood clot in your intestines, it can lead to sharp pains that can be felt in your stomach and abdomin.
You may feel unwell, feel nauseas and have diarrhea with visible blood.
8. Severe headache
A blood clot or bleeding on the brain is called a stroke. It leads to a lack of oxygen in the brain and can cause a blistering headache. It can also cause you to have sudden problems seeing or speaking.
Other common symptoms of a stroke include numbness and paralysis, (often on one side of the bod),confusion and dizziness.

Iran’s ‘Friendly Nations’ List Gives Way to Shifting Access in Strait of Hormuz
Iran’s first move through the Strait of Hormuz looked hard, deliberate, and politically selective. After the late February strikes, Tehran signaled that some countries could still move through the waterway. Reuters reported on March 27 that Foreign Minister Abbas Araqchi named friendly nations, including China, Russia, India, Iraq, and Pakistan. That message suggested Iran was dividing passage by politics, pressure, and wartime interest. At that stage, the Strait of Hormuz looked less like an open trade route and more like a channel Iran would manage on its own terms.
Yet the policy did not remain that narrow for long. Within days, Iraq received an exemption, vessels carrying essential goods won access, and Malaysia-linked ships were cleared. Reuters also reported recent crossings by ships linked to Oman, France, and Japan, provided they had no U.S. or Israeli ties. Shipowners, insurers, and governments are now reading every Iranian signal for signs of a wider reopening or a harder squeeze. A handful of tankers have passed, but the route is still dangerous and commercially strained. What began as a short list has become a shifting system of exemptions, conditions, and calculated leverage across the Strait of Hormuz. This article traces the latest updates to that initial list, examines how Iran’s position has changed, and looks at where passage through the Strait of Hormuz stands now.
How the original list took shape

Iran’s early passage policy appeared to favor a small group of politically aligned countries, yet severe security risks quickly showed that access was never truly guaranteed. Image Credit: Pexels
The early version of the story had a clear internal logic. That is why the headline spread so fast. Iran had answered the late February strikes by restricting movement through the Strait of Hormuz. It then signalled that some countries could still pass. Reuters reported on March 27 that Foreign Minister Abbas Araqchi named friendly nations permitted through. The countries included China, Russia, India, Iraq, and Pakistan. That statement gave editors a usable frame. It suggested Iran was dividing shipping by politics. The idea also matched Tehran’s wider message. Iran had already told the International Maritime Organization that certain states lacked innocent passage rights. It named the United States, Israel and other participants in the attacks. Shipping, therefore, looked split into hostile and acceptable groups.
Reuters also reported that China was pressing Iran over crude and Qatari LNG cargoes. Ship-tracking data showed one vessel moving after marking itself “China-owner.” That detail strengthened the first impression. Tehran seemed to reward states it viewed as useful. It also seemed ready to punish states tied to the war effort. For a breaking headline, that looked tidy and convincing. Yet even the first reports showed strain below the surface. Reuters said two Chinese container ships halted their attempt to leave the Gulf despite Iran’s assurances. A named country, then, did not receive a guaranteed corridor. It received a chance. That distinction matters. The first list was real as a political signal. It was never stable enough to explain the whole situation. The operational backdrop made that weakness harder to ignore.
UKMTO’s Joint Maritime Information Center said on March 6 that no formal legal closure had been declared. It also said, “the operational environment continues to reflect active kinetic hazard conditions.” The advisory warned mariners to “continue to exercise extreme caution.” It said attacks against commercial shipping still posed a high risk. Traffic data in that note showed how badly the route had tightened. Historically, daily transit averaged about 138 vessels. Recent reviews found only 4 confirmed commercial transits in the previous 24 hours. JMIC called that a near-total temporary pause in routine traffic. Reuters added the commercial picture. Analysts at Kpler and Vortexa said about 300 oil tankers remained inside the Strait. They were waiting for clarity that never truly arrived.
Kpler analyst Rebecca Gerdes told Reuters that safe passage “could not be guaranteed.” That short quote says more than the original list did. A government could name a friendly state. Owners still had to judge missile risk, insurance cost, crew safety, and the chance of reversal. Energy and trade bodies show why this mattered so widely. The IEA says nearly 15 million barrels a day of crude passed through Hormuz in 2025. That was about 34% of the global crude oil trade. UNCTAD says the Strait carries around one quarter of global seaborne oil trade. It also carries major LNG and fertilizer flows. Set beside the early Reuters reporting, the first headline starts to look incomplete. It captured the first diplomatic sorting. It did not capture the severe conditions shaping each transit decision.
How the list widened and changed
The first big change came when exemptions spread beyond the states named in the initial reporting. On April 2, Reuters said Manila had received assurances on Philippine passage. The assurance covered Philippine ships and fuel supply through the Strait of Hormuz. The Philippines had not appeared in the early Reuters list tied to Araqchi’s statement. That alone showed the framework was expanding. Two days later, Reuters reported that Iran was allowing vessels carrying essential goods to Iranian ports through the waterway. Those ships had to coordinate with Iranian authorities and follow set procedures. Passage was no longer tied only to nationality. It also depended on cargo and Iran’s own domestic needs. Iraq then pushed the story further. Reuters reported on April 4 that Iran had exempted Iraq from restrictions on transit through the Strait.
On April 6, Reuters reported that Iraq’s state oil marketer SOMO told buyers to submit lifting schedules within 24 hours. SOMO said its loading terminals were fully operational and ready to execute contracts without limitation. That language matters because it showed confidence returning on paper, even if shipowners still hesitated in practice. The policy was becoming more elastic. Iran was no longer simply naming friends. It was deciding when to relax pressure, where to relax pressure and which trade flows served its interests best. That shift is central to the article’s update. It turns the story from a list into a moving policy. Actual vessel movements then made the shift impossible to dismiss. Reuters reported on April 5 that the tanker Ocean Thunder passed through Hormuz with Iraqi crude.
It carried about 1 million barrels of Basrah Heavy. The same Reuters report said the vessel was among 7 Malaysia-linked ships cleared by Iran. That detail changed the meaning of 7 in later coverage. It did not describe a final club of 7 friendly nations. It referred to Malaysia-linked vessels receiving clearance after diplomatic talks. Reuters said Malaysian Prime Minister Anwar Ibrahim confirmed that Iranian officials had agreed to let Malaysian vessels pass toll-free. Reuters also reported that ships linked to Oman, France, and Japan had crossed in recent days. Another Reuters dispatch said Iran would allow passage for vessels without U.S. or Israeli links. That is a broader and more fluid standard. It is still coercive because it excludes large parts of global shipping.
Yet it is no longer a fixed national whitelist. It is a conditional system shaped by diplomacy, cargo, ownership links, and Tehran’s immediate bargaining needs. UNCTAD’s March assessment helps explain why that flexibility matters beyond oil headlines. It warned that disruption in Hormuz affects crude, LNG, fertilizers, food costs, and vulnerable import-dependent economies. Once those wider trade effects are included, the old “7 friendly nations” angle becomes too narrow. Iran began with a politically useful list. It then moved into selective and evolving exemptions as pressure built. That is the cleaner frame now for any updated article or headline going forward this week. More exemptions may emerge as diplomacy and conflict continue colliding.
Where the Strait of Hormuz stands now
None of these crossings means the Strait is functioning normally. The latest official warnings still describe a dangerous operating picture. UKMTO’s Joint Maritime Information Center said the maritime security situation continued to reflect critical kinetic risk. It said attacks remained likely and conditions were still highly hazardous for commercial shipping. The advisory also said no formal legal closure had been declared. Yet it stressed that commercial operators still faced a restricted and highly sensitive transit environment. IMO has echoed that danger in humanitarian terms. It says around 20,000 seafarers, along with port workers and offshore crews, have been affected in the region. In a briefing published on April 2, the IMO Secretary-General issued a blunt warning. He said, “Fragmented responses are no longer sufficient.”
IMO also said it had confirmed 21 attacks on commercial ships since February 28. It reported 10 seafarer fatalities and several injuries. Those figures explain why limited crossings do not equal normal trade. A vessel may pass and still prove nothing about wider confidence. One successful transit does not rebuild schedules or reduce insurance costs. It also does not persuade every owner to send another ship into the Gulf. Reuters reflected that caution after Iraq’s exemption. Some market participants said it remained unclear whether shipowners would return while the war continued. That hesitation is one of the clearest markers of the present moment. Access exists, but confidence does not. The route is usable in fragments, not in a stable commercial sense.
The wider energy picture shows why even partial disruption still matters. The IEA says nearly 15 million barrels a day of crude passed through Hormuz in 2025. That was about 34% of the global crude oil trade. It also says only Saudi Arabia and the UAE can reroute some crude away from the Strait. Even then, bypass capacity is limited. The EIA likewise describes Hormuz as one of the world’s most important oil chokepoints. UNCTAD says the Strait carries about one quarter of global seaborne oil trade. It also carries significant LNG and fertilizer flows. Those numbers explain the pressure building around governments, importers, and markets. Reuters reported on April 1 that IEA Executive Director Fatih Birol described losses above 12 million barrels.
He warned, “We are heading to a major, major disruption.” Reuters also reported that April losses could double March losses. On April 5, Reuters said Brent was near $110 a barrel while WTI was around $111. Those prices followed sharp weekly gains. Refiners had begun seeking alternatives from the United States and Britain, yet those shifts can only soften the blow. They do not reopen Hormuz. So the current position is best described as selective movement under severe stress. Some ships are crossing. Some states are receiving exemptions. Yet the lane remains strategically choked, commercially impaired, and dangerous enough that every transit still looks exceptional instead of routine. That is where the Strait of Hormuz stands right now in practical terms. Insurance fears and military risk still shadow every attempted transit.
What experts think may happen next

Experts expect Iran to keep using the Strait as leverage while any wider reopening depends on fragile diplomacy and security guarantees. Image Credit: Pexels
Most expert analysis now points away from a clean military fix. It points instead toward a long negotiation over access, deterrence, and postwar leverage. Reuters reported on April 3 that recent U.S. intelligence assessments suggested Iran was unlikely to ease its grip soon. The reason was strategic, not only tactical. The Strait gives Tehran rare leverage over Washington and over energy-dependent states far beyond the region. Ali Vaez of the International Crisis Group framed that leverage in stark language. He told Reuters, “The U.S. handed Iran a weapon of mass disruption.” That quote has travelled because it captures the scale of the shift. Iran is no longer threatening only through missiles and proxies. It is also threatened by trade disruption, freight risk, and oil market stress.
Reuters cited one source familiar with the intelligence assessment. The source said Iran had now tasted its power over the waterway. It was therefore unlikely to surrender that leverage soon. That view fits the traffic pattern seen so far. Tehran has allowed narrow movement at chosen moments. Yet it has not given up the broader power to frighten markets, pressure governments, and extract concessions. That means the next phase may turn on bargaining, not reopening alone. Any temporary passage deal could still leave Iran room to tighten access again. That risk grows if talks stall or fresh strikes occur. Diplomatic reporting points in the same direction. Reuters reported on April 2 that about 40 countries discussed ways to reopen the waterway. No concrete operational agreement emerged. President Emmanuel Macron called a military move to force the Strait open “unrealistic.”
He said ships would face Guard attacks and ballistic missiles. Reuters later reported that former CIA Director Bill Burns saw specific Iranian demands ahead. He said Tehran would seek “long-term deterrence and security guarantees” in any settlement. Burns also said Iran would want direct material benefits. On April 6, Reuters reported that UAE adviser Anwar Gargash said the use of Hormuz must be guaranteed. He said that a guarantee should form part of any U.S.-Iran deal. Reuters also reported today that the United States and Iran had received a peace proposal. Iran, however, rejected reopening the Strait as part of a temporary ceasefire. Taken together, those reports suggest three realistic paths. Iran could widen exemptions for countries or cargoes it sees as useful.
It could accept a negotiated reopening tied to sanctions, security guarantees, and wider settlement terms. Or it could tighten access again if diplomacy breaks down or force returns to the center of policy. The common thread is uncertainty. That is why the article should open with the original list, then move into the harder truth. The list mattered at the start. It no longer explains the current state of the Strait of Hormuz on its own. That is also why the next headline needs more room than the first one did this week, especially as exemptions keep shifting and diplomacy stays unsettled for now. Markets, diplomats, and shippers are bracing for further sudden shifts.