<s>[INST] hi,i have recently found a lump on the left side of my ribcage it is above my breast and on the second rib bone down ,it is the size of a walnut,not painful at al ,feels solid as tho its part of my bone,it does not move an you can easily see it sticking out through my skin,im always tired and sufer with terrible backache,my nan passed away when she was 36,due to bone cancer,im 27 [/INST] Hi, thanks for sharing your health concerns with HCM!    If someone comes to me with a non-mobile painless lump, my first and foremost reflex to your question would be "CAUTION" as for this case of hand lump, I would come up with three possibilities, these include: 1.     a neoplastic or malignant tumor  could be cancer!2.     The second possibility is of a benign bony lesion like osteoma or osteochondroma     or dermatofibroma!3.     The last possibility is of some normal / developmental nodule like muscular nodule or just a feeling for you!     Overall, it should not be neglected but you could go for FNAC test / CT scan of chest for confirmation before consulting a surgeon in your area!Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health. </s>