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Small cell lung cancer

Also called: SCLC, Small cell carcinoma of the lung, Oat cell cancer

A fast-growing lung cancer, almost always linked to smoking. It usually responds to treatment at first.

Share of lung cancersAbout 15 in 100
Main causeSmoking

Overview

Small cell lung cancer grows and spreads quickly, often to the brain, liver, or bones. It can also make hormones that cause problems like low sodium.

It's treated mainly with chemotherapy plus immunotherapy, with radiation for some. It usually shrinks quickly with treatment, though it often returns.

Symptoms

Common signs:

  • Cough or a change in a long-standing cough
  • Coughing up blood
  • Shortness of breath

Less common

  • Swelling of the face, neck, or arm
  • Weight loss
  • Confusion or weakness from low sodium

Look up a symptom: Cough lasting more than 3 weeks · Getting winded easily with activity or stairs · Losing weight without trying · Smoke or used to smoke · Spot on the lung, or a smoker with a cough that's new or changed · Swelling of the eyelids, face, hands, feet, or genitals that comes on fast

When to get medical care

Call 911Trouble breathing, heavy bleeding, a seizure, sudden confusion, or fainting: call 911.
Get care todayFever during cancer treatment, or new or quickly worsening symptoms.
See a doctor soonSymptoms lasting more than 2 to 3 weeks.

Causes

Changes in a cell's genes that make it grow out of control. Most happen by chance; some are linked to the risk factors below or to inherited genes.

Does it spread or run in families?

  • Cancer isn't contagious. You can't catch it from someone.

Who is more likely to get it

  • Smoking
  • Radon and asbestos exposure

Diagnosis

Tests look for the cause. Many people checked for these symptoms turn out not to have cancer.

Questions you may be asked

  • When symptoms started and whether they're getting worse
  • Family history of cancer
  • Past illnesses, treatments, and exposures

The exam

A physical exam, focused on where the symptoms are.

Tests

Tests, if needed:

  • Chest CT scan:
  • Biopsy:
  • PET scan and brain MRI:

Treatment

Treatment depends on the type, stage, and your overall health. A cancer care team makes a plan with you.

Self-care

  • Write down symptoms and when they started
  • Bring someone with you to appointments
  • Ask for copies of test results
  • Ask about clinical trials: they can offer new treatments
  • Quit smoking: it helps at every stage

Chemotherapy with immunotherapy, radiation, and sometimes radiation to the brain to prevent spread.

Prevention

To lower risk or find it early:

  • Don't smoke, or quit now

Which doctor treats this

  • Start with your primary care provider (family doctor or internist).
  • They may send you to an oncologist (cancer doctor), often working with surgeons and radiation doctors.

Living with it

  • Keep a simple notebook of symptoms, medicines, and questions for visits.
  • Ask for a survivorship care plan when treatment ends.
  • Gentle activity, like walking, can ease tiredness.
  • A cancer diagnosis can affect mood. Tell the care team if you or your family feel down or anxious.

Support groups and helplines

Back to school, work, or sports

  • Many people keep working during or after treatment.
  • Ask about changes that help, like flexible hours. Workers may be covered by the ADA.

Pregnancy and breastfeeding

  • If you're pregnant or planning to be, tell your cancer team. Some treatments can harm a baby.
  • Ask about saving eggs or sperm before treatment if you may want children later.

For caregivers

  • Go to visits when you can and take notes.
  • Keep a list of medicines, allergies, and doctors in one place.
  • Learn the warning signs that need fast care, like fever during treatment.
  • Take breaks and ask for help. Caregivers need care too.

Outlook

Outlook depends on the type and stage. Cancers found early are usually easier to treat, and treatments keep improving.

Support is available: ask about social workers, nutrition help, and support groups.

Getting ready for your visit

Bring a list of symptoms and medicines.

What to bring

  • A list of medicines and supplements
  • Notes on when symptoms started
  • Past test results and scans

Questions to ask

  • Has it spread outside the chest?
  • Should I have radiation to the brain to prevent spread?
  • What stage is it, and what are the treatment options?
  • Are there clinical trials for me?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Small cell lung cancer

Sources

Last updated 2026-11-13.