A sprain occurs when a ligament, which connects bones at a joint, gets stretched or torn. Sprains typically happen at the ankles, wrists, and knees when a joint is forced into an unnatural position. Symptoms may include pain, swelling, bruising, and difficulty moving the affected joint.
A strain is the stretching or tearing of a muscle or tendon that connects muscles to bones. It often results from overexertion or improper use of muscles, such as lifting heavy objects or sudden movements during physical activity. Strain typically affects the lower back, neck, shoulders, and hamstrings. Symptoms may include pain, muscle weakness, swelling, and muscle spasms.