Muscle discomfort, also known as muscle ACHE, is a common symptom that can be caused by a variety of conditions. It is characterized by a dull, throbbing pain in the affected area and can range from mild to severe. Muscle ACHE is often caused by overuse or strain, but can also be caused by medical conditions such as fibromyalgia or arthritis. Treatment for muscle ACHE typically involves rest, stretching, and over-the-counter medications.