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.
Leg cramps Leg cramps, when a muscle in the leg tightens and doesn't loosen up, causes pain and bulging in the leg. Low potassium (hypokalemia) If the level of potassium in your blood drops below normal, it may cause low energy, leg cramps, and more. Muscle strain Muscle strain occurs when muscles are stressed, overworked, or injured due to physical activity or labor.