Members' NAVLE study guide

Feline Mastitis

1,539 words 7 min read Reviewed November 15, 2026

Mastitis is infection and inflammation of one or more mammary glands. In cats it is uncommon, occurs mainly in lactating queens, and is recognised by hot, painful glands, a sick queen and poorly growing kittens. The treatment has to protect the nursing litter.

Key facts

Mastitis at a glance
  • Species and system: cat; mammary gland (reproductive system).
  • Cause: bacteria entering the gland via the teat, trauma or the blood; E. coli, Staphylococcus and Streptococcus are the usual organisms (MSD).
  • Classic presentation: firm, hot, painful gland or glands in a nursing queen, with fever, anorexia, and abnormal or blood-tinged milk.
  • Diagnosis: milk cytology with degenerate neutrophils; culture and susceptibility testing.
  • Treatment: broad-spectrum antibiotics safe for nursing kittens, compresses, pain control and kitten support.
  • Complications: abscess, gangrene, sepsis.

What's inside

15 sections in the full guide
  1. Key facts
  2. How the NAVLE tests this
  3. Cause and pathophysiology
  4. Clinical signs
  5. Diagnosis
  6. Differential diagnoses
  7. Treatment and management
  8. Prevention, control and public health
  9. Prognosis
  10. Working through a case
  11. When it is not simple mastitis
  12. Exam pearls and common errors
  13. Quick review
  14. Test yourself
  15. References
The full guide also has 4 tables, 3 self-test questions and 5 references, available to NAVLE members.

Read the full study guide

The full guide is part of every NAVLE plan, with diagnosis and treatment tables, figures, a quick review and self-test questions. Start a free trial to try the question bank, or log in if you are already a member.

Read the free overview article A shorter, free article on Mastitis on the NavleExam blog.

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