Health Advice
- Weight Management
- Quit Smoking
- Acne
- Child Health
- Pain
- Oral Care & Hygiene
- Aneurysm, abdominal aortic
- Tummy ache
- Abscess
- Periods, absent
- First aid
- Reflux
- Blackheads
- Acupuncture
- Gallbladder, inflammation
- Leukaemia, acute lymphoblastic
- Leukaemia, acute myeloid
- Addiction
- Addison's disease
- Adenoids and adenoidectomy
- Frozen shoulder
- Agoraphobia
- Air embolism
- Alcohol misuse
- Alcohol poisoning
- Alexander technique
- Rhinitis, allergic
- Indoor allergy
- Mountain sickness
- Alzheimer's disease
- Lazy eye
- Macular degeneration
- Memory loss
- Amniocentesis
- Amputation
- Motor neurone disease
- Steroid misuse
- Iron deficiency anaemia
- Vitamin B12 or folate deficiency anaemia
- Anaesthesia
- Anal fissure
- Brain aneurysm
- Angelman syndrome
- Anger management
- Angina
- Angioedema
- Arteriography
- Stent insertion
- Dog bites
- Fractured ankle
- Ankylosing spondylitis
- Anorexia nervosa
- Smell sense, loss of
- Antacid medicines
- Penicillin
- Anticoagulant medicines
- Antidepressants
- Antifungal medicines
- Antihistamines
- NSAIDs
- Antisocial personality disorder
- Hypochondria
- Anxiety disorders in children
- Stress
- Appendicitis
- Wrist, broken
- Arterial thrombosis
- Arthritis
- Asbestosis
- Asthma
- Astigmatism
- Eczema
- Atrial fibrillation
- Hearing tests
- Bird flu
- B12 vitamin deficiency
- Skin rashes in babies
- Weaning
- Lumbago (low back pain)
- Septic arthritis
- Halitosis (bad breath)
- Weight loss surgery
- Barium enema
- Bartholin's cyst
- Pressure ulcers
- Bedbugs
- Nocturnal enuresis
- Behçet’s disease
- Facial paralysis
- Tongue pain or soreness
- Prostate enlargement
- Beta-blockers
- Bicarbonate test
- Binge eating
- Biopsy
- Bipolar disorder
- Spider bite
- Eye, black
- Bladder cancer
- Cystitis
- Bladder stones
- Blisters
- Blood donation
- Blood gases test
- Blood groups
- Coughing up blood
- Semen, bloody
- Urine, blood in the
- Vomiting blood
- Septicaemia
- Hypertension
- Low blood pressure
- Blood tests
- Blood transfusion
- Blushing
- Bromhidrosis (body odour)
- Bone cyst
- DXA scan
- Bone marrow donation
- Stem cell transplant
- Borderline personality disorder
- Bottle feeding
- Botulism
- Rectal cancer
- Polyps, bowel
- Leaky gut syndrome
- Orthodontics
- Brain abscess
- Head injury, severe
- Brain tumour, benign (non-cancerous)
- Brain tumour, malignant (cancerous)
- Brain tumours
- Breast abscess
- Breast cancer
- Male breast cancer
- Screening for breast cancer
- Nipple discharge
- Mastitis
- Breast lump
- Breastfeeding
- Shortness of breath
- Osteoporosis
- Fractured collarbone
- Hip fracture
- Leg, broken
- Fractured nose
- Rib injuries
- Toe, broken
- Tooth, broken or knocked out
- Smelly feet (bromodosis)
- Bronchitis
- Teeth grinding
- Thyroid eye disease
- Bulimia
- Burns and scalds
- Heart bypass
- Caesarean section
- Food poisoning
- Cancer
- Thrush
- Thrush, men
- Thrush, oral - adults
- Thrush, oral - babies
- Carbon monoxide poisoning
- Cardiovascular disease
- Cartilage damage
- Nasal congestion
- Rib, cervical
- Smear test
- Sore lips
- Chemotherapy
- Chest infection, adult
- Chest pain
- Herpes zoster virus
- Statins
- Kidney disease, chronic
- Leukaemia, chronic lymphocytic
- Leukaemia, chronic myeloid
- Cirrhosis
- Claustrophobia
- Cluster headaches
- White coated tongue
- Gluten intolerance
- Herpes simplex virus
- Cold
- Colic
- Colostomy
- Coma
- Combined contraceptive pill
- Pneumonia
- CT scan
- Concussion
- Hole in the heart
- Heart failure
- Conjunctivitis
- Constipation
- Contact dermatitis
- Corns and calluses
- Coronary heart disease
- Vegetative state
- Topical corticosteroids
- Steroid medication
- Cosmetic surgery
- Cough
- Counselling
- Leg cramps
- Crohn's disease
- Swallowing pills (problems)
- Undescended testicles
- Lacerations
- Cystic fibrosis
- Psoriatic arthritis
- Dandruff
- Date rape drugs
- Thyroiditis
- Hearing impairment
- Dehydration
- Tooth abscess
- Teething
- Tooth decay
- Fluoride
- False teeth (dentures)
- Depression
- Dyspraxia in children
- Diabetes insipidus
- Diabetes
- Diabetic ketoacidosis
- Diabetic retinopathy
- Dialysis
- Traveller's diarrhoea
- Nutrition
- Rectal examination
- Double vision
- Nummular eczema
- Shoulder dislocation
- Diverticular disease and diverticulitis
- Lightheadedness
- Down's syndrome
- Dry eye syndrome
- Thirst
- Dyslexia
- Periods, painful
- Indigestion
- Swallowing problems
- Dyspraxia (adults)
- Swimmer's ear
- Earache
- Earwax
- Eating disorders
- Ebola virus disease
- Ectopic pregnancy
- Restless legs syndrome
- Endoscopy
- Threadworms
- Tennis elbow
- Epidural
- Epilepsy
- Watering eyes
- Nosebleed
- Impotence
- Tremor (essential)
- Ocular cancer
- Eye injuries
- Red eye
- Falls
- Family planning
- Fever, childhood
- Fibromyalgia
- Flat feet
- Wind
- Seasonal flu
- Nail patella syndrome
- Food allergy
- Foot pain
- Frostbite
- Gallstones
- Stomach removal surgery
- Gastroenteritis
- Gastritis
- Gastroparesis
- Gastroscopy
- General anaesthetic
- Genetics
- Herpes, genital
- Warts, genital
- Rubella
- Gestational diabetes
- Gum disease
- Goitre
- Gout
- Recurrent limb pain in children
- Iron overload disorder
- Haemophilia
- Haemophilus influenzae type b
- Piles (haemorrhoids)
- Ingrown hairs
- Leukaemia, hairy cell
- Hallucinations
- Hamstring injury
- Hand pain
- Tendon repair, hand
- Hand, foot and mouth disease
- Hangover
- Seasonal allergic rhinitis
- Head and neck cancer
- Head injury, minor
- Nits
- Headaches
- Hearing and vision tests for children
- Myocardial infarction
- Heart block
- Palpitations
- Heart transplant
- Heart-lung transplant
- Heat exhaustion and heatstroke
- Sweat rash
- Periods, heavy
- Hepatitis A
- Hepatitis B
- Hepatitis C
- Hepatitis
- Herbal medicines
- Hernia, femoral
- Hiatus hernia
- Hernia, inguinal
- Hernia, umbilical
- Hernia
- Herpes simplex eye infections
- Hip pain in adults
- Hip replacement
- HIV and AIDS
- Welts
- Lymphoma, Hodgkin
- Homeopathy
- Hormone replacement therapy (HRT)
- Huntington's disease
- Rabies
- Hyperglycaemia
- Sweating, excessive (hyperhidrosis)
- Joint hypermobility
- Sleepiness in the day (severe and unexplained)
- Thyroid, overactive
- Hypnotherapy
- Testosterone deficiency (hypogonadism)
- Underactive thyroid
- Irritable bowel syndrome
- Painkillers, ibuprofen
- Shoulder tendon, trapped
- Urinary incontinence
- Infertility
- Inflammatory bowel disease
- Ingrown toenail
- Inquest
- Insomnia
- Type 1 diabetes
- Intensive care
- IVF
- Jaundice in newborns
- Jaundice
- Stings, sea creatures
- Jet lag
- Joint pain
- Kidney stones
- knee-pain
- Knee replacement
- Knee surgery, anterior cruciate ligament
- Milk intolerance
- Laryngeal (larynx) cancer
- Laryngitis
- Laxatives
- Legionnaires' disease
- Weil's disease
- Liver cancer
- Liver disease
- Liver transplant
- Local anaesthetic
- Twisted neck
- Tetanus
- Loss of libido
- Sperm count, low
- Lumbar puncture
- Swelling or lump
- Lung cancer
- Lung transplant
- Lyme disease
- Non-Hodgkin lymphoma
- Lymphoma
- Magnesium test
- MRI scan
- Malaria
- Male contraceptive pill
- Malnutrition
- Mastectomy
- Rubeola
- Shin splints
- Skin cancer (melanoma)
- Meningitis
- Menopause
- Metallic taste in mouth
- MRSA infection
- Migraine
- Miscarriage
- Mobile phone safety
- Moles
- Travel sickness
- Oral cancer
- Mouth ulcers
- Multiple sclerosis
- Mucositis
- Multiple system atrophy
- Mumps
- Muscular dystrophy
- Selective mutism
- Short-sightedness
- Nose and sinus cancer
- Polyps, nose
- Nasopharyngeal cancer
- Natural family planning
- Nausea and vomiting in pregnancy
- Peripheral neuropathy
- Night sweats
- Nightmares
- Rhinitis, non-allergic
- Type 2 diabetes
- Winter vomiting disease
- Obesity
- OCD (obsessive compulsive disorder)
- Sleep apnoea
- Occupational therapy
- Swollen ankles
- Oesophageal cancer
- Periods, irregular
- Organ donation
- Orthopaedics (orthopaedic surgery)
- Osteoarthritis
- Rickets
- Osteopathy
- Pacemaker implantation
- Shoulder pain
- Paracetamol
- Ulcerative colitis
- Pancreas transplant
- Pancreatic cancer
- Pancreatitis, acute
- Pancreatitis, chronic
- Panic disorder
- Pins and needles
- Paralysis
- Parkinson's disease
- Pelvic pain
- Ulcer, peptic
- Ruptured eardrum
- Pericarditis
- Periods
- Peripheral arterial disease
- Peritonitis
- Personality disorder
- Whooping cough
- Strep throat
- Phobias
- Physiotherapy
- Pilonidal sinus
- Plastic surgery
- Pleurisy
- Pneumococcal infections
- Poisoning
- Reflux in babies
- Potassium test
- Pre-eclampsia
- Slipped disc
- Urinary PSA test
- Prostate disease
- Prostatitis
- Psoriasis
- Puberty
- Radiation
- Radiotherapy
- Red blood cell count
- Rheumatic fever
- Rheumatoid arthritis
- Root canal treatment
- Roundworm
- Seasonal affective disorder (SAD)
- Salivary stones
- Salmonella infection
- Scabies
- Scarlet fever
- Scars
- Schizophrenia
- Sciatica
- Scoliosis
- Scurvy
- Self-harm
- Septic shock
- Sexual health clinics
- STIs
- Shingles
- Social anxiety disorder (social phobia)
- Vomiting in children and babies
- Sinus headache
- Sinusitis
- Skin rashes in children
- Sleep paralysis
- Sleepwalking
- Urine, smelly
- Snake bites
- Snoring
- Spina bifida
- Spinal muscular atrophy
- Sports injuries
- Sprains
- Squint
- Stuttering
- Stomach cancer
- Streptococcal infections
- Stroke
- Stye
- Suicide
- Sunburn
- Swollen glands
- Syphilis
- Tuberculosis (TB)
- Tension-type headaches
- Testicular cancer
- Testicular lumps and swellings
- Thyroid cancer
- Tics
- Tinnitus
- Tongue-tie
- Tonsillitis
- Toothache
- Total iron-binding capacity (TIBC or transferrin) test
- Total protein test
- Tourette's syndrome
- Toxic shock syndrome
- Traction
- Travel vaccines
- Trigger finger
- Typhoid fever
- Ultrasound scan
- Urinary tract infection, children
- Urinary tract infection
- Vaginitis
- Vaginal cancer
- Vaginal discharge
- Varicose eczema
- Varicose veins
- Warts and verrucas
- Vertigo
- Vitamins, minerals and supplements
- Vomiting in adults
- Warfarin
- Weight loss (unexpected and unplanned)
- Whiplash
- Wisdom tooth removal
- X-ray
- Yellow fever
- Bowel cancer screening
Latest from blog
Every parent’s heart sinks when they receive the dreaded note from school warning about head lice. Don’t worry – Jane Brennan from Brennan’s Life Pharmacy in Donabate is here to to give us advice and tips. The first thing to do is to check the child’s head. You will need some tea tree conditioner, a... Read more >
Read moreWe ask Jane Brennan from Brennan’s Life Pharmacy Donabate how to make the most of great sunny summer days whilst protecting our skin from harmful rays. Jane says “The Irish Cancer Society SunSmart program has great guidelines to keep us safe. See below for some useful tips and advice” Ways to protect your skin: Shade... Read more >
Read morePollen Highs & Watery Eyes… Talk to Jane Brennan, your Hay Fever Expert in Donabate Are your eyes itchy, red or watery? Is your throat scratchy? Are you sneezing? Do you have itchy ears, nose or mouth? Do you have a blocked or runny nose? Do you wake up feeling exhausted? Hay fever can cause... Read more >
Read moreNHS Choices - Causes of underactive thyroid
(12/09/2014)
An underactive thyroid (hypothyroidism) is when your thyroid gland doesn't produce enough of the hormone thyroxine, also called T4.
Most cases of underactive thyroid are due to either the immune system attacking the thyroid gland or a damaged thyroid.
Immune system
Most cases of underactive thyroid happen when the immune system, which normally fights infection, attacks the thyroid gland. This damages the thyroid, which means it is not able to make enough of the hormone thyroxine, and leads to the symptoms of an underactive thyroid.
A condition called Hashimoto's disease is the most common type of autoimmune reaction that causes an underactive thyroid.
It is not clear what causes Hashimoto’s disease, but the condition runs in families. It is also common in people with another disorder related to the immune system, such as type 1 diabetes and vitiligo.
Previous thyroid treatment
An underactive thyroid can also occur as a side effect or complication of previous treatment to the thyroid gland, such as surgery or a treatment called radioactive iodine therapy.
These treatments are sometimes used for overactive thyroid (where the thyroid gland produces too much hormone) or thyroid cancer.
Less common causes
Worldwide, a lack of dietary iodine is a common cause of an underactive thyroid because your body needs iodine to make thyroxine. However, iodine deficiency is uncommon in the UK.
In some cases, babies are born with an underactive thyroid because the gland does not develop properly in the womb. This is called congenital hypothyroidism and it is usually picked up during routine screening soon after birth.
A problem with the pituitary gland could lead to an underactive thyroid. The pituitary gland is located at the base of the brain and regulates the thyroid. Therefore, damage to the pituitary may lead to an underactive thyroid.
An underactive thyroid has also been linked to some viral infections or some medications used to treat other conditions, such as:
- lithium - a medication sometimes used to treat certain mental health conditions, including depression and bipolar disorder
- amiodarone - a medication sometimes used to treat irregular heartbeats (arrhythmias)
- interferons - a class of medication sometimes used to treat certain types of cancer and hepatitis C
Speak to your GP or specialist if you are concerned that a medication you are taking may be affecting your thyroid hormone levels.