Dear lybrate-user, Backpain, joint pains and headache at an age of 31, without being overweight, needs evaluation to rule out inflammatory arthritis
, but before you go for any investigation, my recommendation would be for you would be to have a look at your life style, be active, exercise regularly, have healthy food and watch if your symptoms improve. Give yourself a time of at least 2 weeks and see if this works. Let us know if this helped you. Thanks.