Muscle weakness refers to a reduced ability to exert force with muscles, making it difficult to perform everyday activities. It can affect one muscle group or multiple groups and may result from various factors, including injury, illness, or lack of physical activity. Conditions like muscular dystrophy or neuropathy can also lead to muscle weakness. This condition can be temporary or chronic, depending on the underlying cause. Symptoms may include fatigue, difficulty lifting objects, or trouble climbing stairs. Treatment often involves physical therapy, exercise, or addressing the specific medical condition contributing to the weakness.