Triple Negative Breast Cancer now S-TSH is 7.9 anyone else?

Does this mean that you have an underactive thyroid? Or?
Do you feel there is a connection between the two things? I've had low thyroid for more than 20 years, but well-treated. Recent breast cancer but not triple negative. It is always concerning to find something else problematic when in the midst of a breast cancer diagnosis. How are you doing? Will you have chemo before surgery? Dows the thyroid seem treatable? I'm sorry no one has weighed in with this exact situation, but keep us updated and wishing you all the best.

It means my thyroid is now under active. My dr says I will need more tests. I was first diagnosed in January with TNBC. My thyroid tested fine in October but high in February. The current plan is 12 weeks of chemo with 4 rounds of immunotherapy then surgery followed by 8 rounds of chemo and immunotherapy. I have now done 1 round immunotherapy and just finished second week of chemo. So far I am doing well with it some nausea but meds work. Mostly achy and so tired.

Wishing you well with the rest of treatment, including surgery.
In my experience, it was easy to treat my thyroid although it does need to be watched. I take levothyroxine to bring the levels up to normal and it works perfectly. It takes energy for you to deal with more than one thing--hope the next bit is smooth.

If your thyroid is under active, that can certainly contribute to the fatigue. No history myself but my husband who has a completely different kind of cancer started having this issue.
As soon as he started levothyroxine like @mir123 he started feeling better. We always had assumed he was just tired from his treatments, your body is going through a lot right now, be gentle with yourself.
Since our oncologist doctors are typically really focused on our cancers, have you talked to your primary care doctor about the thyroid?

Yes, I had Triple Negative at 38, and my immunotherapy (Keytruda) knocked out my thyroid - first it rose, then fell, and before it fell too far I started levothyroxine.

This was a side effect I was told could happen from UCLA - I did feel any side effects but we could see the levels rising/falling in my blood work.

We tracked my TSH every infusion as they rose, and then when they started to lower brought in an endocrinologist to start levothyroxine before the levels dropped too far.

So now I have been on levothyroxine, and will stay on it for the rest of my life. But it's pretty easy to keep up and I am happy to have gotten the chance to get the immunotherapy.