<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi doctor, I have been having some back cramps or spasms along with shortness of breath, chest tightness, sharp chest pain, and difficulty breathing. What could be the problem?  <response>: Based on your symptoms, it is possible that you are experiencing Premature ventricular contractions PVCs, which is an irregular heartbeat that can cause those symptoms. I recommend conducting a thorough cardiac evaluation to confirm the diagnosis. 