Left leg pain has many different causes. It could be due to injury to a certain part or structure of the leg – such as a fracture, burisitis, tendonitis, a muscle strain, or a ligament sprain. It may also be due to neurological reasons, such as diabetes neuropathy or nerves compressed in the low back. Deep vein thrombosis may also be a cause of your left leg pain. This is a blood clot that develops within a major vein in your leg – typically in the calf. Symptoms include pain and swelling – and in more serious cases, a pulmonary embolism may occur.
If it feels like a cramping sensation, you left leg pain may be due to nutritional deficiencies or dehydration. These aspects can cause your muscles to become sore and cramp up. This is most commonly experienced in the calf at night.