Low white blood cell count

What causes a low white blood cell count?

Common causes include:

• cancer treatment, like radiotherapy
• anti-psychotic drugs
• medication for an overactive thyroid
• some cancers, like leukaemia
• infections such as HIV or hepatitis
• autoimmune disorders, like rheumatoid arthritis

Some groups, such as people of Afro-Caribbean and Middle Eastern descent, often have a low white blood cell count but this is normal and doesn't increase their risk of infections.

"Agranulocytosis" and "neutropenia" are common conditions that cause a low white blood cell count.

Treating a low white blood cell count

A blood test can tell you if your white blood cell count is low.

Your treatment will depend on what is causing your condition and will often include antibiotics.

You may also need specific treatment:

• to boost your white blood cells
• if you've got an infection

Signs of an infection may include:

• high temperature of 38C or above
• chills and shivering
• sore throat
• mouth sores that keep returning
• toothache
• skin rashes
• tiredness
• flu-like symptoms

Occasionally, infections can lead to a life-threatening condition called sepsis.

See your GP if:

• you know you're at risk of a low white blood cell count and you get an infection
• you keep getting infections

Things you can do yourself to avoid infections

If you have a low white blood cell count caused by illness or medication you should take steps to avoid infections.