Muscles very sore, particularly arms, unrelated to exercise. Tired. Lack energy. What could be some causes?

Sore muscles. Myalgia.Sore muscles or inflammation of muscles. May be medication related - trazadone dehydration, electrolyte imbalance - calcium and magnesium. May be the trazadone, but be sure to check with your dr before you stop the medication.
There are many. Possibilities, but if you were my patient, given your gender and your age the first thing that i would check for is polymyalgia rheumatica. The test is a simple blood test called an erythrocyte sedimentation rate. Please see your family doctor for a definitive work-up.

Related Questions

Muscles very sore, particularly arms, unrelated to exercise. Lack energy. Tired. What could be reason?

Several possibilitie. Muscle soreness is known as myalgia. This, plus lack of energy, and fatigue could be a virus, which usually resolves in about 3 weeks. Abnormal sleep state, depression could be other causes. There are some muscle disorders such as polymyositis and polymyalgia rheumatica, or some neurologic entities that need be considered if this goes on for more than 3 wks; if so, see your primary care doc. Read more...