The Siamese
The following diseases are reported to occur more frequently in the Siamese than in the general cat population. In some cases the disease either has, or is believed to have, a genetic, hereditary cause but many of the diseases listed here do not have a proven genetic basis. 

If you do not find the disease that you are looking for in this list the disorder has probably not been reported to occur more frequently in this breed than in the cat population as a whole. Try to find it through the search button.

Alimentary tract diseases
This section includes diseases that involve the mouth, oesophagus (gullet), stomach, small intestine (duodenum and ileum), large intestine (colon and rectum), liver and pancreas.

Diseases involving the mouth

• Cleft palate/lip

Diseases affecting the gullet (oesophagus)

• Megaoesophagus 

Diseases involving the stomach

• Gastric retention (pyloric)

Diseases involving the pancreas

• Diabetes mellitus

Diseases affecting the small intestine

• Adenocarcinoma

Diseases affecting the large intestine

Blood diseases

• Haemophilia B (Factor IX, Christmas disease) (sex-linked)
• Porphyria (hereditary)

• Adenocarcinoma (small intestine)
• Basal cell tumour
• Insulinoma
• Intestinal adenocarcinoma
• Lipoma
• Mammary tumours
• Mast cell tumours
• Nasal cavity tumours
• Parathyroid tumours
• Sweat gland tumour

Heart valve disorders

Abnormal development of major blood vessels to the heart

• Patent ductus arteriosus

Heart muscle disease

• Dilated cardiomyopathy
• Taurine deficiency

Other

• Endocardial fibroelastosis
• Persistent atrial standstill

Diseases of the cornea

• Corneal sequestration

Diseases of the eyeball

• Convergent strabismus and nystagmus (congenital)
• Glaucoma
• Microphakia

Diseases of the eyelids

Diseases of the third eyelid (nictitating membrane)

Diseases of the lens

• Cataract (congenital)

Diseases of the retina

• Lysosomal storage diseasess, including :
  • Mucopolysaccharidosis VI (autosomal recessive)
• Retinal degeneration

Hormonal diseases

• Hyperparathyroidism (primary)
• Insulinoma and hyperinsulinaemia

Immune system diseases

• Systemic lupus erythematosus

Liver diseases

• Amyloidosis
• Portosystemic shunts (congenital)

Nervous system diseases

• Deafness (congenital)
• Hydrocephalus
• Hypereaesthesia syndrome
• Lysosomal storage diseases - 
  • ceroid lipofuscinosis
  • GM1 gangliosidosis (autosomal recessive)
  • Mucopolysaccharidosis VI (autosomal recessive)
  •  sphyngomyelinosis (autosomal recessive)
• Myasthenia gravis (congenital)
• Vestibular disease

Orthopaedic diseases

• Hip dysplasia
• Mucopolysaccharidosis VI (autosomal recessive)
• Myasthenia gravis (congenital)
• Nutritional secondary hyperparathyroidism

Respiratory diseases

• Chylothorax
• Feline asthma

Skin diseases

• Aguirre syndrome
• Blastomycosis
• Cryptococcosis
• Demodicosis (generalised)
• Epidermolysis bullosa
• Eyelid coloboma
• Feline acromelanism
• Food hypersensitivity
• Histoplasmosis
• Hypotrichosis (congenital) (autosomal recessive)
• Junctional epidermolysis bullosa
• Periocular leukotrichia
• Pinnal alopecia
• Psychogenic alopecia
• Sporotrichosis
• Skin tumours
• Systemic lupus erythematosus
• Tail sucking
• Tuberculosis (cutaneous)
• Vitiligo

Other

• Blastomycosis
• Cryptococcus
• Histoplasmosis
• Mycobacterium avium
• Reactions to griseofulvin