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Brits are warned to "call 999" immediately if they spot two potentially life-threatening signs of a blood clot. The NHS has highlighted that these warning indicators could mean the clot has travelled to the lungs, which requires emergency medical care.

While blood clotting plays a vital role in stopping excessive bleeding from injuries, clots that don't dissolve naturally can cause severe problems by obstructing blood flow to different areas of the body. "Blood clots can be very serious and need to be treated quickly," the NHS says.

Typically, a blood clot will first form in a vein in the leg or arm. This is known as deep vein thrombosis (DVT).

Signs of DVT in the leg include:

Throbbing pain in one leg (rarely both legs), usually in the calf or thigh, when walking or stan

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