Sudden leg pain is not caused by insufficient water intake. Reports indicate that these conditions are usually caused by a health problem that affects the nerves in the legs. Johns Hopkins Medicine. Radiculopathy refers to a condition in which a nerve within the spine is pinched or compressed. It can cause pain in the body or sensations such as the legs. Pinched nerves can be caused by being overweight, improperly sitting, or lifting heavy objects that are not properly formed.
Diabetic Neuropathy, however, is caused by long-term high blood glucose (perMayo Clinic). High blood sugar can damage nerves and blood vessels, making it difficult for them to communicate properly. This can lead to pain in the feet or legs and tingling. This condition can lead to severe complications such as sudden lightheadedness and infections. Peripheral artery disease (PAD), which is caused by narrowing of the arteries, is similar to Type 2 diabetes. Healthline). Plaque builds up in the blood vessels, which prevents blood flow to your extremities, including your legs. This can cause numbness or pain. This restriction of blood can occur in any artery so it puts you at risk for stroke and heart attack. Adventitial cystic Disease, which causes leg pain and reduces blood flow, is a rare condition. It occurs when a cyst forms and presses on the artery behind your knee. Cleveland Clinic).