
Blood clots don’t always announce themselves with obvious warning signs. In many cases, the symptoms are subtle, easy to dismiss, or mistaken for something harmless like muscle strain or fatigue. That’s what makes them so dangerous—because when a clot goes untreated, it can travel to the lungs, heart, or brain and become life-threatening.
Conditions like deep vein thrombosis (DVT) and pulmonary embolism (PE) send thousands of Americans to the emergency room every year. In fact, some clots cause no symptoms at all until complications occur, which is why awareness is critical. Here are seven hidden blood clot symptoms you should never ignore—and what they could mean.