Chronic Lymphocytic Leukemia (CLL)
What is Chronic Lymphocytic Leukemia (CLL)?
Chronic lymphocytic leukemia is a type of blood cancer that develops slowly over time. It affects a specific kind of white blood cell called lymphocytes, which normally help your body fight infections. In CLL, your bone marrow produces too many abnormal lymphocytes that do not work properly. These cells crowd out healthy blood cells and accumulate in your blood and lymph nodes.
CLL is the most common type of leukemia in adults in the United States. It typically affects people over age 60, though it can occur at younger ages. Unlike acute leukemias that progress quickly, CLL develops slowly. Many people live for years without symptoms or treatment. The condition is not caused by anything you did or did not do.
Because CLL progresses gradually, some people discover they have it through routine blood work before any symptoms appear. Early detection through blood testing allows you and your doctor to monitor the condition and start treatment when needed. Understanding your blood markers helps track disease progression and guide care decisions.
Symptoms
- Swollen lymph nodes in the neck, armpits, or groin that do not hurt
- Frequent infections that keep coming back
- Feeling unusually tired or weak throughout the day
- Unintended weight loss over several months
- Night sweats that soak through clothing or bedding
- Feeling full quickly when eating, or discomfort below the ribs
- Easy bruising or small red spots on the skin
- Fever without an obvious infection
Many people with early stage CLL have no symptoms at all. The condition is often found during routine blood work done for other reasons. Symptoms typically develop slowly over months or years as abnormal lymphocytes increase.
Concerned about Chronic Lymphocytic Leukemia (CLL)? Check your levels.
Screen for 1,200+ health conditions
Causes and risk factors
CLL develops when genetic changes occur in the DNA of blood-producing cells in your bone marrow. These changes cause the cells to produce abnormal lymphocytes that grow out of control and live longer than normal cells. Scientists do not fully understand what triggers these genetic changes. CLL is not inherited in most cases, though having a family member with the condition does increase your risk.
Risk factors include being over age 60, being male, being of European or North American descent, and having a family history of CLL or other blood cancers. Exposure to certain chemicals like Agent Orange may increase risk. Unlike many cancers, CLL is not linked to smoking, diet, or lifestyle choices. Most people diagnosed with CLL have no known risk factors other than age.
How it's diagnosed
CLL is usually diagnosed through blood tests that measure different types of blood cells. A complete blood count with differential shows elevated lymphocyte levels, which is the primary sign of CLL. Doctors look for an absolute lymphocyte count greater than 5,000 cells per microliter that persists for at least 3 months. Additional tests examine the specific characteristics of these lymphocytes to confirm they are cancerous B-cells.
Rite Aid offers blood testing that measures lymphocyte counts and platelet counts, two key markers for detecting and monitoring CLL. Platelet counts below 100,000 per microliter can indicate more advanced disease. Regular testing helps track disease progression over time. If your blood work shows concerning results, your doctor may order additional specialized tests to confirm diagnosis and determine disease stage.
Treatment options
- Active monitoring through regular blood tests and checkups when the disease is not progressing
- Targeted therapy drugs that attack specific proteins on cancer cells
- Chemotherapy medications that kill rapidly dividing cells
- Immunotherapy treatments that help your immune system fight cancer cells
- Stem cell transplant for younger patients with aggressive disease
- Antibiotics or antiviral medications to prevent and treat infections
- Blood transfusions if anemia or low platelet counts become severe
- Eating a nutrient-dense diet to support immune function and energy levels
- Getting adequate rest and managing stress to support overall health
- Avoiding people who are sick to reduce infection risk
Concerned about Chronic Lymphocytic Leukemia (CLL)? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Chronic leukemia develops slowly over months or years, while acute leukemia progresses rapidly over days or weeks. CLL produces abnormal cells that still function somewhat, so many people live without symptoms for long periods. Acute leukemias require immediate treatment, while CLL is often monitored without treatment initially.
Yes, CLL is often discovered during routine blood tests done for other reasons. A complete blood count showing elevated lymphocyte levels is typically the first sign. If your lymphocyte count stays above 5,000 per microliter for at least 3 months, your doctor will investigate further. Early detection through regular blood testing allows for better monitoring and timely treatment.
Many people with early stage CLL do not need immediate treatment. Doctors use a watch and wait approach called active monitoring when the disease is not causing symptoms or progressing. You will have regular blood tests and checkups to track disease activity. Treatment typically begins when symptoms develop or blood counts indicate progression.
Testing frequency depends on your disease stage and how quickly it is progressing. People with early stage CLL may need blood tests every 3 to 6 months. Those receiving treatment or with more active disease may need monthly testing. Your doctor will determine the right schedule based on your lymphocyte counts, platelet levels, and other factors.
Your lymphocyte count directly measures the number of cancerous white blood cells in your blood. Higher counts generally indicate more active disease. Rapidly rising lymphocyte counts may signal that treatment is needed. Tracking this number over time helps your doctor understand if CLL is stable or progressing.
Low platelet counts can indicate that CLL cells are crowding out normal blood cell production in your bone marrow. Platelet levels below 100,000 per microliter indicate stage III disease, which influences treatment decisions. Low platelets also increase bleeding and bruising risk. Monitoring platelet counts helps assess disease severity and treatment response.
While lifestyle changes cannot cure CLL, they support your overall health and immune function. Eating nutrient-rich foods, getting adequate rest, managing stress, and staying physically active within your energy limits all help. Avoiding infection through good hygiene and limiting exposure to sick people is especially important. These habits support your body during active monitoring or treatment.
CLL is not directly inherited in most cases, but family history does increase risk. Having a first-degree relative with CLL raises your risk about 7-fold compared to the general population. If multiple family members have CLL or related blood cancers, genetic counseling may be helpful. Most people with CLL have no family history of the disease.
People with CLL are more prone to respiratory infections like pneumonia, bronchitis, and sinus infections. Skin infections and urinary tract infections also occur more frequently. Your abnormal lymphocytes do not fight infections effectively, leaving you vulnerable. Contact your doctor promptly if you develop fever, persistent cough, painful urination, or other signs of infection.
Yes, many people with CLL achieve remission with treatment, meaning no signs of cancer can be detected in blood or bone marrow. Some remissions last for years before the disease returns. Newer targeted therapies have improved remission rates and duration. Even during remission, ongoing monitoring through blood tests remains important to catch any relapse early.