4. Change in defecation or bladder habits
Stools may change in size and color if you have colon or rectal cancer. Other signs include constipation or diarrhea. If it is prostate or bladder cancer, you will feel painful urination and see blood in your urine.
5. Indigestion or difficulty swallowing
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Head and neck cancers also have specific symptoms. For example, patients find it difficult to swallow food and drinks. They also suffer from indigestion. Stomach cancer and laryngeal cancer also have similar signs.
