This is most likely an acute back pain due to muscle spasm.
Back pain is one of the commonest diseases in humans. It may be caused by a wide variety of lesions, but is often quite harmless and relieved by simple measures.
If you are having an internal pain in the back rather than in the muscle area, other causes of back pain like renal stones and GIT issues like diverticulitis also need to be excluded. Hence you must determine whether the pain seems to be internal or in the muscle area.
Back pain is most commonly due to muscle pain. The measures that you should take are:
Avoid stressing the back - avoid anything like lifting heavy objects, standing for long periods, bending forwards. For now give rest for 1 day. Lie mostly on the bed as far as possible for the day, but do gentle stretching exercises.
Warm compresses- warm compresses are often helpful. You can also go for deep warmth with ultrasound and lasers which can be given at physiotherapist clinics.
Massage: a hand held massager if available can work wonders.
Tab. Motrin 200 mg - take one tab. twice daily.
Lumbar belt: this is available at pharmacies. Use a soft lumbar belt specially when moving about.
Firm mattress: your mattress should not be too soft or too hard. Use a firm mattress.
Physiotherapy: do gentle exercises for the back - start gently on the bed itself as long as the pain is there, but once you recover you must continue doing these exercises so that they do not recur. Look up here for exercises:
If the pain lasts for a long period, gets more severe or becomes recurrent, you have to show your doctor to rule out spinal causes.
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Thank you and I wish you the best of health - stay safe!
Dr. P. Jyoti