The blood can become more sticky when you’re dehydrated. With DVT, the le can “become hot, swollen and tender”.
As the blood clot can travel to the lung (a pulmonary embolism), it requires urgency medical attention.
Sensitivity to the cold is called Raynaud’s phenomenon, even though the arteries and veins are healthy,
For people with this condition, their blood vessels narrow in response to cold temperatures, which restricts blood flow.