If pain suddenly appears in the muscles of the lower arm, it is important to analyze which part of the body is experiencing the pain and what is causing it. If the pain is due to trauma, consider the symptoms caused by damage to the muscle fibers and determine whether it is a flexor or extensor injury to the lower arm by analyzing whether the pain is palmar or dorsal to the lower arm. If the pain is caused by fatigue, such as pain caused by too much exercise or fitness, it is caused by excessive contraction of muscle fibers over a long period of time, resulting in muscle fiber fatigue and its production of creatine that cannot be metabolized, causing the pain. Colds and fevers can also cause muscle aches and pains, and the symptoms of this condition are usually mild. So if there is pain in the muscles of the lower arm, it is important to analyze what causes it and choose the appropriate treatment according to the cause, such as trauma or sports injury, which can be reduced by rest and braking. If it is caused by a cold or fever, it is recommended to treat the primary cause to reduce the symptoms.