text: Several monoclonal antibodies, such as bevacizumab and cetuximab, can cause different kinds of side effects. These side effects can be categorized into common and serious side effects.
  Some common side effects include:
  * Dizziness
  * Headaches
  * Allergies
  * Diarrhea
  * Cough
  * Fever
  * Itching
  * Back pain
  * General weakness
  * Loss of appetite
  * Insomnia
  * Constipation
  Among the possible serious side effects are:
  * Anaphylaxis
  * Bleeding
  * Arterial and venous blood clots
  * Autoimmune thyroiditis
  * Hypothyroidism
  * Hepatitis
  * Heart failure
  * Cancer
  * Anemia
  * Decrease in white blood cells
  * Stomatitis
  * Enterocolitis
  * Gastrointestinal perforation
  * Mucositis