27years/m,last year tsh=1.66,t4=6.90,t3=1.58,but now tsh=3.68,t4=8.4,t3=1.36, doctor says recheck and check anti tpo,why doestsh in one year increase?

Still normal: All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Talk to the doctor who ordered the tests. Having said that, your results are normal. You are probably bugging your doctor so s/he suggested one more, though, appropriate, test. Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.