I had a back spasm last night and one again this afternoon. right after the spasms my back aches for a while.. ?

Spasms strain muscle: My first thought is "why are you having back spasms". Spasms are an over contraction of the muscle. Over contraction of a muscle causes them to become painful. The best treatment for back spasms is stretching and strengthening of your core muscles. Anti-inflammatories can help the pain. Good luck!

Muscle: Muscular back spasms are very common. Try a warm bath or heating pad to the affected area and a temporary NSAID( Ibuprofen). Most resolve fairly quickly. If they do not or become a recurring problem see your primary care physician for evaluation(diagnosis)and further treatment options.best of luck!!