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Hi, its very surprising that at 19 yrs loss of lumbar lordosis. Because this takes years together to happen. Hot fomentation and physiotherapy should b done.

You should take physiotherapy which includes electro therapy and exercise therapy. You should consult a physiotherapist in person for complete assessment and treatment.

Now you are 19years old. So don't think about surgery.

No need for surgery, you need proper rest, avoid standing for prolonged time, dont lift any objects while bending down. Take Electrotherapy treatment for 2 weeks, it will be reduced, After reducing of pain you will be suggested with strengthening exercises, which you need to continue for a month to make lower back muscles strong. Visit nearby physiotherapy clinic and take IFT+US for 2 weeks. rest as much as possible.

Visit your nearby physio therapy clinic for proper treatment. Yo need back muscle strengthening after electro therapy

If there is no pain down the leg or no weakness or pain standing on a single leg then with further testing nerve root or local issues are ruled out by physical assessment. For this you need to visit a physiotherapist

It can be treated by physiotherapy sir,first visit nearby physiotherapy clinic for proper assessment and treatment Take electrical modalities treatment to reduce pain and spasm.after reducing pain start doing mobilization and strengthening exercises to ur back.