Dr Bernadette Carr is here to answer your questions

I am a woman in my 30s. Recently, I have been tired all the time, feeling cold and although I eat a healthy diet, I have put on weight. 

There is a history of thyroid problems in my family.

Given the symptoms you are experiencing, your weighty gain and your family history, I would advise you to make an appointment with your GP so that a diagnosis can be made.