What are common symptoms of cystic fibrosis?

Cystic fibrosis is a genetic disorder that primarily affects the respiratory and digestive systems due to mutations in the CFTR gene. The hallmark of cystic fibrosis is the production of thick, sticky mucus that can obstruct airways and lead to severe respiratory problems, including chronic cough, lung infections, and difficulty breathing.

In addition to respiratory symptoms, cystic fibrosis also impacts digestive health. The thick mucus can block pancreatic ducts, impairing the pancreas's ability to release enzymes necessary for digesting food. As a result, individuals with cystic fibrosis often experience malabsorption, leading to symptoms such as poor weight gain, diarrhea, and nutritional deficiencies.

The other symptoms listed in the options, such as hypoglycemia after meals, joint inflammation with skin rashes, and weight gain accompanied by hyperactivity, are not characteristic of cystic fibrosis. These symptoms are associated with different medical conditions and do not align with the primary issues caused by cystic fibrosis. Thus, the most accurate representation of the common symptoms of cystic fibrosis is the production of thick mucus and digestive issues.