2 months ago, I found a painful, hard lump on my left breast. I booked a GP appointment where she told me that she could feel the lump plus another and therefore referred me to the breast clinic. Just under a month later, I had the appointment at the breast clinic which involved an examination and an ultrasound. The doctor drew on my breasts where he felt thickness of tissue etc and I went for the ultrasound. During the ultrasound, I felt excruciating pain as they are already painful, especially when touched. However, after the ultrasound, I was informed that there were no abnormalities found on the ultrasound and that the "lumps" I felt was just thick breast tissue. However, since reading into this, I've found that thick breast tissue shouldn't be painful and I'm not sure if this is related but the lumps are hard, not soft at all. I left the appointment, not feeling reassured at all as no one really fully explained to me why I was experience this pain and weird sensations in the areas where I found lumps.

Does anyone know if it's worth going back through my GP to get more information or is it a waste of time and should I just accept the information I've been given? The lumps are also only present in one breast and I would imagine that if I just had thick breast tissue, that this would obviously be present in both breasts and not just the one.

I also read somewhere that thick breast tissue can stop breast lumps from appearing on mammograms, let alone ultrasounds. Whether or not I am being paranoid, I'm unsure but I would at least like a mammogram or perhaps a biopsy as I simply don't understand how this is normal breast tissue.

I was also told at the appointment that thickness of the breast is normal at my age as I'm still growing (I'm 18 and haven't grown since about 14/15), I do look much younger than my age but perhaps they are right. I'm just unsure and anxious about the whole situation.

Any insight or opinion would be really helpful and appreciated:)