Thank you for the query.
Higher cold sensitivity
and hair loss can be caused by hypothyroidism
. This happens when thyroid gland does not produce enough thyroid hormones. This result with whole body metabolism
slow down. The most common reason is iodine deficiency
but can be also caused by immune deficiency
, some medicines (amiodarone), and many more.
The other symptoms which can be present are fatigue, dry, itchy skin, decreased sweating, constipations.
I suggest you to start your diagnostics with thyroid hormones level (TSH, FT3, FT4).
Hair loss can be also caused by improper diet, low ions, vitamins and proteins intake. So the next step is your diet verification.
You can also start taking Biotin, it can help.
Hope this will help. Feel free to ask further questions.