I have just joined this forum so apologise in advance for my ignorance. I have been on lvothyroxine 50mg for 3 years but I am having symptoms again conducive with hypothyroidism. My nails are brittle, hair falling out, headaches, exhausted, cold hands and feet (unusual for me) and unexplained weight gain, to name a few. I have just had normal results from my blood test but I'm sure my symptoms are thyroid related. I am told my T4 is 14 and TSH 4.1. Please can anyone advise?