If the brain's blood supply is decreased too much, the person may pass out (syncope). Symptoms may worsen when changing position from lying down or sitting, to standing up. In addition to feeling dizzy, associated symptoms may include: 1  Sweating. 2  Weakness. 3  Nausea and vomiting. 4  Shortness of breath. 5  Chest pain.
Although most muscle cramps are harmless, some may be related to an underlying medical condition, such as: 1  Inadequate blood supply. Narrowing of the arteries that deliver blood to your legs (arteriosclerosis of the extremities) can produce cramp-like pain in your legs and feet while you're exercising. 2  Nerve compression.
Some of the conditions that can cause leg cramps include: 1  Dehydration â when your body loses a lot of fluids, the salt levels get depleted, which can trigger the muscles in the legs to contract. 2  Usually, the reason for dehydration is not drinking enough, but severe diarrhea and vomiting can cause it as well.