Hello Welcome to HCM, thanks for posting your query.
I read your question completely and have understood it..
Well, your age 63 being a risk factor for
breast cancer, make sure if it's in the breast or, just below.
I am not trying to scare you, but you should be knowing this.
Generally,
levothyroxine is very much safe and doesn't cause any such problems. I encounter so many such people, being a surgeon.
I suggest you these things..
1. Make sure if there's a swelling or no.
2. If it's just a pain, note the kind of pain and the exact region.
If, it's anywhere near the region of the left breast, then I suggest you, please go for triple assessment which is gold standard for breast cancer.
Which includes
1. Clinical examination
2. Imagining
3. Histopathology
You can meet a surgeon and get a
mammogram done. This will tell you what exactly it is.
Family history of breast cancer again becomes important here.
If it's away from breast, then just chill out. No need to worry.
Take
paracetamol tablet 500mg whenever you feel slight pain.
This should help you.
In case you need any help with this, contact me.
Take care..