What causes leg weakness and aching?

Leg weakness and soreness can be caused by multiple factors: 1. Muscle fatigue: Accumulation of lactic acid due to overexertion or prolonged standing or walking may cause temporary soreness and weakness. 2. Malnutrition: Deficiencies in electrolytes such as calcium, magnesium, and potassium, or insufficient vitamin D, may lead to muscle weakness. 3. Neurological disorders: Conditions such as peripheral neuropathy, spinal cord diseases, or multiple sclerosis can affect nerve conduction and cause muscle weakness. 4. Bone and joint problems: Arthritis, osteoporosis, or fractures may reduce the leg's load-bearing capacity, causing a feeling of weakness and soreness. 5. Poor circulation: Conditions such as varicose veins or deep vein thrombosis can impair blood return and lead to leg discomfort. If leg weakness and soreness persist, especially accompanied by other symptoms such as pain, numbness, or swelling, prompt medical attention is advised.