Chemotherapy-Induced Disorders
Side effects and complications of chemotherapy
Quick Facts
- Type: Cancer treatment side effects
- Common effects: Low blood counts, nausea, hair loss
- Key risk: Infection from low white cells
- Seek urgent care: Fever during or after chemo
Overview
Chemotherapy uses powerful medicines to destroy or slow the growth of cancer cells. Because these drugs target rapidly dividing cells, they also affect some healthy cells that divide quickly, such as those in the bone marrow, digestive lining, hair follicles, and mouth. This is why chemotherapy can cause a range of side effects, known together as chemotherapy-induced disorders.
The specific effects depend on the drugs used, their doses, and the individual. Some are short-lived and improve after treatment ends, while others can be more lasting. Many side effects can be prevented or eased with supportive medicines and careful monitoring. The most important point is that some complications, especially fever caused by low white blood cells, are medical emergencies that need urgent care.
Common Effects
Chemotherapy-induced disorders affect many parts of the body:
- Low blood counts: Low white cells (infection risk), low red cells (anemia with fatigue), and low platelets (easy bruising and bleeding)
- Digestive: Nausea, vomiting, diarrhea, constipation, and mouth sores
- Hair and skin: Hair loss and skin or nail changes
- Nerves: Numbness, tingling, or pain in the hands and feet (peripheral neuropathy)
- General: Tiredness, loss of appetite, and a higher risk of infection
- Other: Effects on fertility, the heart, kidneys, or other organs with certain drugs
Causes
Chemotherapy works by harming cells that divide quickly, which is a key feature of cancer. The same action affects normal fast-dividing cells:
- Bone marrow: Reduced production of blood cells leads to low counts.
- Gut lining: Damage causes nausea, mouth sores, and bowel changes.
- Hair follicles: Affected cells lead to hair loss.
- Nerves and organs: Some drugs are toxic to nerves, the heart, kidneys, or ears.
Each chemotherapy drug has its own pattern of effects, which is why care teams choose regimens and supportive treatments based on the expected risks.
Risk Factors
- Higher doses or more intensive regimens
- Combining several chemotherapy drugs
- Older age or frailty
- Existing heart, kidney, liver, or nerve problems
- Poor nutrition
- Other treatments such as radiation at the same time
Monitoring
Side effects are tracked through regular monitoring during and between cycles:
- Blood counts: Checked frequently to watch white cells, red cells, and platelets.
- Organ function tests: Kidney, liver, and sometimes heart tests for drugs that affect these organs.
- Symptom review: Asking about nausea, numbness, mouth soreness, bowel changes, and fatigue at each visit.
- Infection watch: Clear instructions to report fever immediately, since infection can be serious when white cells are low.
Management
Most chemotherapy side effects can be prevented or eased with supportive care:
- Nausea: Anti-sickness medicines given before and after treatment.
- Low blood counts: Growth-factor injections to support white cells, transfusions for severe anemia or low platelets, and antibiotics for infection.
- Infection prevention: Hand hygiene, avoiding sick contacts, and prompt treatment of fever.
- Mouth sores and bowel changes: Mouth care, and medicines for diarrhea or constipation.
- Nerve symptoms: Adjusting the drug or dose and treating pain.
- Fertility and organ protection: Discussing options before treatment and monitoring organs at risk.
The care team often adjusts doses or timing to balance treating the cancer with limiting harmful effects.
Reducing Risk
- Take anti-sickness and other supportive medicines as prescribed
- Report fever (often 38°C/100.4°F or higher) immediately, day or night
- Practice careful hand hygiene and avoid people who are unwell
- Keep all blood test and follow-up appointments
- Stay nourished and hydrated, with help from a dietitian if needed
- Tell your team about numbness, mouth sores, bleeding, or breathlessness early
When to Seek Help
Fever during or after chemotherapy is an emergency. When white blood cells are low, an infection can become life-threatening quickly. Seek urgent care right away for:
- A temperature of 38°C (100.4°F) or higher, or chills and feeling very unwell
- Unusual bleeding or bruising, or blood in urine or stool
- Severe or persistent vomiting or diarrhea, or signs of dehydration
- Severe breathlessness, chest pain, or new confusion
Always follow the specific emergency instructions from your cancer care team, including who to call at any hour.
Frequently Asked Questions
What are the most common chemotherapy side effects?
Common effects include low blood counts, nausea and vomiting, hair loss, mouth sores, bowel changes, tiredness, and a higher risk of infection. Some drugs also cause numbness in the hands and feet. Many can be prevented or eased with supportive care.
Why is fever during chemotherapy an emergency?
Chemotherapy can lower white blood cells, which fight infection. With low white cells, an infection can spread fast and become life-threatening. A fever of 38°C (100.4°F) or higher during or after chemo needs urgent medical care, day or night.
Does chemotherapy always cause hair loss?
Not always. Hair loss depends on the specific drugs and doses; some cause significant loss while others cause little or none. When it occurs, hair usually regrows after treatment ends.
Can chemotherapy side effects be permanent?
Most side effects improve after treatment ends, but some, such as nerve damage, fertility effects, or organ injury from certain drugs, can be longer lasting. The care team monitors for these and adjusts treatment when possible.
How is chemotherapy nausea managed?
Anti-sickness (anti-nausea) medicines are usually given before and after treatment to prevent nausea and vomiting. Eating small, bland meals, staying hydrated, and telling the team if nausea persists so medicines can be adjusted all help.
References
- National Cancer Institute (NCI). Chemotherapy side effects.
- American Cancer Society. Managing chemotherapy side effects.
- MedlinePlus, U.S. National Library of Medicine. Chemotherapy.
- Mayo Clinic. Chemotherapy.