Diphtheria effects on the body

The bacteria may grow in the nose or throat and produce a toxin. Local inflammation can create a thick coating and swelling that interferes with swallowing or airflow. The toxin may travel through the body and injure tissues, sometimes causing marked tiredness, an irregular heartbeat, weakness, or difficulty moving the palate and other muscles. Kidney irritation can also occur. These effects may develop after the initial throat illness, which is why medical monitoring matters even when symptoms seem to settle. A sore throat alone has many causes and does not show that diphtheria is present.

Contact a healthcare service promptly if diphtheria is suspected or you have had close contact with someone diagnosed with it. Keep away from vulnerable household members until you receive advice, and do not share food, drinks or personal items. Follow instructions about testing, antibiotics and any antitoxin treatment. Completing prescribed [Antibiotic Treatment](/treatments/medical-management/antibiotic-treatment/) helps clinicians manage the infection, but treatment decisions must be individualised. Check whether your vaccination schedule is current; [Childhood Immunisation](/treatments/preventive-care-and-vaccination/childhood-immunisation/) explains routine prevention.

Call emergency services for trouble breathing, a tight or swollen neck, inability to swallow, drooling, fainting, chest discomfort, a racing or irregular heartbeat, or new weakness. These symptoms can reflect airway obstruction or toxin-related organ effects. Prompt care is also needed for worsening throat pain with a membrane, especially after a known exposure. Do not wait for every possible effect to appear.

Ask which body systems need monitoring, whether household contacts require testing or preventive medicine, and how long isolation precautions should continue. Ask how to recognise breathing changes and whether a booster vaccination is appropriate. For throat symptom context, read [Sore Throat](/symptoms/sore-throat/).