My daughter had thyroid cancer and initially was taking only T4 but still felt tired, extremely cold and was gaining weight. She then started taking T3 along with the T4 and felt better, was no longer cold or tired and started to lose some weight. This lasted for several months, however starting in about November / December she again started feeling tried, was cold most of the time and started gaining weight. Does stress, cold or other things effect the absorption or effectiveness of T4 and T3?
Stress does have a major impact on thyroid levels regardless if taking medication.
Has she had any recent blood testing done? It may be that her medication just might need upgrading. Often in winter many people notice they need a touch more meds for the duration and can lower again when summer comes.
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