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Glucagonoma is an extremely rare pancreatic α‑islet cell tumor and is often accompanied by certain clinical symptoms including necrotizing migratory erythema (NME), diabetes, weight loss and anemia. The objectives of the current review were to discern the clinical features, diagnosis, treatment and prognosis of glucagonoma by evaluating 623 reported cases. A 1998 study reviewed 407 cases and 216 cases were reported in studies published after 1998. The current review consisted of 268 males and 339 females, with an average age of 52.4 years. The male‑to‑female ratio was 0.79. The incidence of typical clinical findings were as follows: NME, 82.4% (350/425); diabetes, 68.5% (291/425); weight loss, 60.2% (256/425); anemia, 49.6% (211/425); and glossitis or stomatitis or cheilitis, 41.2% (175/425). A total of 499 cases reported the location of the tumor as the pancreas and 64.1% (320/499) involved the pancreatic tail. Tumor size was recorded in 58.3% (126/216) cases reported after 1998 and average tumor size was 5.0 cm. Metastasis was detected in 49.2% of patients (293/595 for whom metastasis or no metastasis were recorded) upon diagnosis. These patients were older than those without metastasis (average age, 54.0 years old vs. 50.8 years old). The average time between symptoms and diagnosis of glucagonoma was 31.4 months. Glucagonoma is a very rare disease. It is important for clinicians to learn more about this disease to be able to diagnose and treat it as early as possible, thus improving patient prognosis. [ABSTRACT FROM AUTHOR]