Final answer:
The ailment described with pain and stiffness at muscle attachment points is Fibrositis (A). It should not be confused with tendinitis, which involves inflammation of tendons and is typically caused by repetitive strains.
Step-by-step explanation:
The ailment described in the question is characterized by aches, pain, and stiffness in joints and muscles, especially at common tender points such as the front of the elbow, hip joint, rear of the knee, or shoulder. The correct answer to the question is A) Fibrositis, also known as myofascial pain syndrome or muscular rheumatism, which involves inflammation of the muscle tissue and the formation of tender points. It should not be confused with tendinitis, which is the inflammation of a tendon generally caused by repetitive motions over time that strain the tendons, leading to pain and tenderness around a joint. Unlike fibrositis which affects muscular tissue, tendinitis affects the connective tissue that attaches muscles to bones. The treatment for tendinitis includes rest, the PRICE guidelines (Protection, Rest, Ice, Compression, and Elevation), and possibly the use of NSAIDs to reduce inflammation and pain.