Many signs may not be distinctive to cancer but run through all other diseases. Below are some general symptoms.
One cancer sign is unexplained weight loss. Night sweats and fever often accompany the weight loss. Again, it could be just because of normal causes however generally a sign. Back pain, pelvic pain, bloating, or indigestion may be early symptoms with some forms such as bone or testicular cancer. Usually, pain is a symptom of advanced disease. Skin cancer may produce visible skin signs such as darkening hyper-pigmentation, yellowing, reddening, generally skin color changes. Change in bladder function, constipation, diarrhea, frequent urination, small amounts of urine, and slow urine flow. Pain with urination, blood in urine, and any changes could be signs. However again, these are not conclusive unless tested and proved.
There are many signs and we cannot list them all here, we can however pray that God will intervene before any of the symptoms crystalize to become full blown cancer.