Temporary pressure for an extended period on an area (such as sitting or standing) can result in a numbing or tingling sensation. Pressure on nerves through injury or as a result of a growth or tumour can also cause these symptoms.
Other medical conditions that might cause numbness include:
Ischaemia occurs when plaque (a fatty deposit) builds up on your artery walls causing a restriction in the flow of blood and oxygen to tissues. Limb ischaemia most commonly affects the legs and feet. It is a severe form of peripheral arterial disease but can also occur due to a blood clot (deep vein thrombosis).