Why does my cat have persistent itching and hair loss?

Itching and hair loss in cats can be caused by many factors, including parasites, skin infections, allergies, or dietary reactions. Your vet will use examinations and tests to systematically rule out each possibility — a clinic visit is the best way to confirm the cause.

What simple care and observations can I do at home?

Take photos and videos of affected areas, record how often your cat scratches, and note any changes in appetite or bowel habits. Avoid using potentially irritating cleaning products or fragrances — all this information helps your vet make a more accurate assessment.

What tests does the vet usually run to find the cause?

Common tests include skin scraping and cytology, fungal culture, blood and biochemistry panels, and urinalysis. A skin biopsy or advanced imaging may also be arranged if needed.

How often should I bring my cat back for follow-up?

The frequency of follow-up visits depends on your cat's condition and the treatment plan. Initial check-ins are typically scheduled within 2–4 weeks, with intervals adjusted over time based on progress. Follow your vet's guidance on scheduling.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Feline Hyperaesthesia Syndrome in Cats: Symptoms, Skin Checks & Treatment Guide [2025]

Feline hyperaesthesia syndrome (FHS) presents as rippling skin along the back, excessive grooming, and sudden frantic running. It may be linked to anxiety or neurological issues. Treatment includes environmental enrichment and behavioural medication.

Take 1 minute to check the symptoms first

Last updated: 2026/01/05

Pethealthmap Editorial Team

Sources: ISFM, WSAVA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek immediate veterinary care (emergency)

•Large areas of skin ulceration or heavy bleeding
•Severe skin swelling accompanied by overall weakness
•Persistent intense scratching causing open wounds

Schedule a clinic visit as soon as possible (within 24-72 hours)

•Repeated, uncontrollable severe itching
•Localized or widespread hair loss that expands rapidly within a short time
•Marked decrease in appetite with a sustained drop in energy

01What Symptoms Indicate a Problem?

Skin sensitivity in cats often presents with itching and hair loss, and may be accompanied by redness, crusting, or behavioural changes.

Patchy or widespread hair loss with noticeably reduced coat density
Repeated intense scratching or excessive grooming leading to bald patches
Red, crusted, or visibly flaky skin
Small wounds or pigment changes on the skin
Increased nighttime activity or signs of restlessness and agitation
Early evaluation by a dermatology or specialist clinic is recommended

Seek emergency care immediately if you notice the following symptoms:

⚠️ Extensive bleeding or large areas of skin ulceration
⚠️ Severe swelling accompanied by signs of systemic illness

02How Can You Assess the Problem Yourself? Home Observation Tips and Emergency Criteria

Observing and recording changes in your cat's skin condition and daily habits at home helps your vet assess the progression and possible causes.

Take close-up photos and videos of the affected area and scratching behaviour
Note when hair loss or itching first appeared and how it has changed over time
Monitor whether appetite and water intake remain normal
Record the frequency and appearance of bowel movements for any abnormalities
Weigh your cat daily and note any changes in energy levels and sleep patterns
If symptoms worsen, arrange a clinic visit as soon as possible

03How Will the Vet Make a Diagnosis? Common Examination Procedures

At the clinic, the vet will carry out a full physical assessment and targeted skin examinations to rule out infections, parasites, and other causes.

Physical examination

inspection of the skin, hair follicles, and lymph nodes

Blood and biochemistry tests to assess overall health and rule out internal disease

Urinalysis to exclude other systemic conditions

Skin scraping and cytology (microscopy) to identify parasites or bacteria

Skin biopsy to confirm chronic or complex lesions

Fungal culture or PCR testing to rule out fungal infection

Advanced imaging (such as CT) or referral to a dermatology specialist when needed

04How Is It Treated After Diagnosis? Medication, Diet Adjustments, and Home Care Guide

Treatment typically combines medication with environmental and dietary adjustments, with regular follow-up visits to monitor effectiveness and side effects.

Follow your vet's prescribed medication or topical treatments and attend all scheduled follow-up appointments
Elimination or hypoallergenic diet trial: monitor your cat's response to a low-allergen or prescription diet
Reduce exposure to known irritants at home, such as fragrances, dust mites, or chemical cleaning products
Continue photographing skin lesions and recording behavioural changes for comparison at follow-up visits
Attend regular check-ups and use photos to track improvement in skin condition
If symptoms recur or treatment is ineffective, ask for a referral to a dermatology specialist

05What Should You Prepare Before the Appointment? Key Information to Help the Vet Identify the Cause Quickly

Document when symptoms began, how often they occur, and how they have changed day to day

List all current and past medications or supplements your cat has received

Note the brand, formula, and ingredients of your cat's recent food

Bring close-up photos of affected areas and videos of scratching or unusual behaviour

Bring any recent lab reports or medical records if available

Use a secure carrier and call ahead to book an appointment

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.

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Hair loss