Which condition can result from excessive glucagon secretion?

Excessive glucagon secretion is primarily associated with hyperglycemia. Glucagon is a hormone produced by the alpha cells of the pancreas that plays a crucial role in regulating blood glucose levels. When blood sugar levels are low, glucagon is released to stimulate the liver to convert glycogen into glucose, which then enters the bloodstream, thus increasing blood glucose levels.

In cases where there is excessive glucagon secretion, the liver continuously releases too much glucose into the bloodstream. This can overwhelm the body's ability to manage blood sugar levels effectively, leading to elevated blood glucose, or hyperglycemia. This condition can be particularly concerning in individuals with diabetes, who may already struggle with blood sugar regulation.

Other options listed do not relate to glucagon's primary role in glucose metabolism. Hypoglycemia refers to low blood sugar, which is not a direct effect of glucagon but rather its opposite. Hypocalcemia and hyperkalemia are conditions related to calcium and potassium levels in the body, respectively, and are not influenced by glucagon secretion. Thus, the link between excessive glucagon and elevated blood sugar makes hyperglycemia the correct answer in this context.