A five-checkpoint guide to figuring out what the scale is really telling you THE ANSWER IN ONE SENTENCE Levothyroxine is not expected to directly cause fat gain, but weight can rise after treatment if the dose is too low, absorption is inconsistent, the body is recovering from hyperthyroidism, fluid is shifting, or another health factor is involved. Seeing the scale move upward after starting thyroid medicine can make it feel as though the prescription is…