how-cancer-affects-immune-system

The immune system is your body’s natural shield. It recognises harmful invaders like bacteria, viruses, and abnormal cells, and works tirelessly to keep you safe. But cancer changes this balance in ways that are often invisible until symptoms appear.

Cancer begins when abnormal cells grow uncontrollably. At first, the immune system does notice them. In fact, many abnormal cells are destroyed before they ever become a problem. But some cancer cells are clever, they find ways to hide, adapt, or even trick the immune system into ignoring them.

Here’s how cancer weakens immunity:

• Immune evasion: Cancer cells disguise themselves so the immune system cannot recognise them as threats.
• Immune suppression: Some tumours release chemicals that “switch off” nearby immune cells, making them ineffective.
• Nutrient drain: Cancer consumes energy and resources that the body would normally use to keep the immune system strong.
• Treatment effects: Chemotherapy and radiation, while powerful against cancer, can also lower white blood cell counts and weaken defences temporarily.

This is why patients with cancer often become more prone to infections or take longer to recover from illness.

The good news is that modern medicine is finding ways to turn the tables. Treatments like immunotherapy are designed to wake up the immune system, making it stronger and more alert in its fight against cancer.

I often tell patients: Think of your immune system as a vigilant army. Cancer may try to weaken it, but with the right care, nutrition, rest, treatment, and medical support, this army can be rebuilt and strengthened to fight back.