Hi. Thanks for your query. Noted the history of lower back ache and pain down the left thigh to the knee and around left hip, seems to be related to the bowel movements - the muscles on either sides of spine get hurt on passing bowel movement, MRI did not show anything to worry about, going to Physiotherapist, coffee seems to take edge off. Your symptoms are akin to sciatica and although the MRI is nor showing much, you may still get the pains due to radiculopathy. In this condition the muscles when go into spasm causes nerve entrapment deep within which are supplying the area of affection. Hence I would advise you the following: Consult a Neurosurgeon or Orthopedic Surgeon for clinical evaluation, examination and advise for the Physiotherapist to have a proper exercises to reduce the muscle spasm and equalize the muscles on both the sides. Also needed are: Take stool softener to have smooth passage of motion so that the muscles do not go into spasm Take muscle relaxants. Warm water bath Relaxation techniques. Avoid all the foods and beverages that enhance your problems.