Fibromyalgia manifests in many different ways, and symptoms can vary greatly from person to person. Typical symptoms include constant, widespread pain in various parts of the body and severe fatigue. Many also suffer from sleep disturbances, morning stiffness, and cognitive symptoms such as memory problems and difficulty in concentrating. Additionally, fibromyalgia can cause headaches and mood swings. Symptoms can worsen with stress, weather changes, or physical exertion.