Chronic lymphocytic leukaemia (CLL)
Chronic lymphocytic leukaemia (CLL) is a slow-growing blood cancer that may not need treatment at first. When it does need treatment, there are many effective drugs that can keep the CLL under control.
![A headshot of Erica, who has chronic lymphocytic leukaemia (CLL), wearing a thick knitted jumper smiling into the camera.](https://bcuk.cdn.ngo/images/Screenshot_2020-03-05_at_14.49.05.2e16d0ba.fill-512x275.png)
What is CLL?
CLL is a chronic (slow growing) blood cancer that affects cells called lymphocytes. When you have CLL, your body makes abnormal lymphocytes that grow too fast.
Find out more
![An older man wearing a white shirt and grey jumper is in consultation with his doctor. He is making eye contact and looks like he is asking a question.](https://bcuk.cdn.ngo/images/iStock-1224859645_EXTENDED_DARKEN_.28c7f21c.fill-512x275.jpg)
Prognosis for CLL
CLL can't usually be cured, but it can be treated so you can continue to have a good quality of life.
The general outlook
![Woman lying on sofa looking tired.](https://bcuk.cdn.ngo/images/mel-elias-fatigue-unsplash.2e16d0ba.fill-512x275.jpg)
CLL symptoms and diagnosis
Many people with CLL are diagnosed after a routine blood test and won't haven’t noticed any symptoms, but others do.
Know the symptoms
![A researcher wearing a facemask inspects a vial of blood on a table with other vials.](https://bcuk.cdn.ngo/images/Blood_tests_and_researcher.2e16d0ba.fill-512x275.png)
Testing for CLL
You’ll have tests before and after diagnosis to confirm that you have CLL, monitor it, and monitor any treatment you may need.
Tests you may need
![A variety of pills](https://bcuk.cdn.ngo/images/Drugs.2e16d0ba.fill-512x275.png)
CLL treatment and side effects
When treatment is needed, you will be offered options that are right for you and your situation.
Read more
![A woman with short grey hair sitting on the sofa in a living room, on a video call with someone on her laptop.](https://bcuk.cdn.ngo/images/iStock-1271537320.2e16d0ba.fill-512x275.jpg)
Active monitoring (watch and wait)
Some people with CLL won't need treatment straight away, or even for months or years. This is called active monitoring, or watch and wait.
Check-ups for CLL
![A man having chemotherapy in hospital](https://bcuk.cdn.ngo/images/man_having_treatment.2e16d0ba.fill-512x275.jpg)
CLL and infection
CLL affects your immune system, so even if you don’t need treatment, you’re more likely to get infections.
Find out more
![An image of a nurse in uniform working at a hospital.](https://bcuk.cdn.ngo/images/RS3001_BCC_250322_498.2e16d0ba.fill-512x275.jpg)
Clinical trials
You may be able to join a clinical trial as part of your treatment for CLL.
Find out more
Many thanks to Professor Adrian Bloor and Dr Piers Patten for checking the medical accuracy of our information about CLL.