Asymptomatic, frequently grow slowly for long period of time before symptomatic
Lower GI bleeding (occult or visible BRBPR/hematochezia
Fatigue, generalized weakness due to anemia
Change in bowel habits, constipation, tenesmus in rectal<unk> 
Obstruction if mass large enough (left colon > right)
Abdominal pain
Focal pain or Peritonitis if perforation
Signs/symptoms of metastatic disease (e.g. hepatomegaly, ascites, lymphadenopathy) may be initial presentation
Abdominal pain
Focal pain or Peritonitis if perforation
Focal pain or Peritonitis if perforation
Colorectal cancer
Upper GI Bleeding
Colitis
Diverticular disease
Ischemic colitis
Diverticulosis
Peptic ulcer disease
Diverticulitis