Is it normal for hypothyroidism to stop one from having periods? Am overweight thanks to thyroid. Trying to lose now. Would overweight cause it? I

Both can. But most likely your menses are affected by your increased weight as only severe hypothyroidism usually halts menses due to very high TSH and subsequent prolactin elevation. Reduction of weight by just 10-15% could be all it takes to allow your ovaries to resume ovulation and menses. Hope this helps. Good luck.