<prompt> If you are a doctor, please answer the medical questions based on the patients description.I keep having sharp pains in the lower right side of the back of my head. Last for about 10-20 sec and occurs about every 30 minutes. I have a metal mitral valve and take blood pressure, warafin and colorestol medicines. In addition, am being treated for a cold.  <response>: Hi sirmadam, Thanks for your question on Chat Doctor. Common Causes of Lower Left Back Pain:-1. Bulging or herniated discs.2. Muscle spasms.3. Pulled back muscle.4. Muscle imbalances.5. Muscle strain, injury or trauma to the back muscles, ligaments or joints.6. Trigger points.7. Stress Negative emotions. If lower left back pain is particularly severe, it may be an indication of a herniated or ruptured disc, or sciatica. Recommended Treatments for Lower Left Side Back Pain:-1. Muscle Balance Therapy.2. Massage Therapy.3. Trigger Point Therapy.4. Inversion Decompression Therapy.5. Acupuncture Acupressure.6. Use a Back Support or Cushion.7Relaxation, Meditation.8. Dietary improvements i.e. reducing foods that cause inflammation like dairy, wheat gluten, sugar, nightshades.9. Chat Doctor. Left Side Back Pain Prevention:-1. While walking and sitting, keep a relatively upright posture2. When lifting objects heavy or light, always lift with the legs-never bend from the waist3. Exercise; focus on working out the muscles in the core abdomen and back4. Daily Stretching. Hope I was helpful. Have a healthy day. 