Across Nigeria, climate change is quietly worsening the country’s hypertension and diabetes crisis, ODIMEGWU ONWUMERE examines. Rising heat, food inflation, and air pollution are forcing millions to abandon healthy diets, safe exercise, and consistent medical care. Erratic rainfall and floods destroy farms, pushing families toward cheap, salty and sugary foods that spike blood pressure and blood sugar. Power cuts leave insulin unrefrigerated, while generator smoke and firewood damage blood vessels. With NCD prevalence at 16.8% and treatment costs pushing 20% of households into poverty, experts warn the weather is now a direct threat to chronic disease management

In Kano, Musa Abdullahi wakes up at 4am to walk before the sun gets cruel. He is 52, diabetic, and his doctor told him to exercise every day. But by 9am the heat is already punishing, and by noon the streets are empty except for hawkers and bike men.

“If I go out later, my sugar goes up and my head pounds,” he says.

“The heat just finishes me.”
Musa’s story is no longer unusual. Across Nigeria, doctors are seeing the same pattern: patients with hypertension and diabetes getting worse, not because they stopped taking drugs, but because the weather, the market, and the air around them changed.

Public health experts now warn that climate change is no longer just about floods and failed harvests. It is showing up in clinics, in blood pressure readings, and in insulin fridges that go off when the light goes.

The link starts with heat. Nigeria’s average maximum temperatures and number of hot days have increased in the last two decades, while rainfall has become more erratic. For people living with high blood pressure, that matters. In extreme heat the body works harder to cool itself. The heart pumps faster. Dehydration thickens the blood, and blood pressure spikes. Professor Akin Osibogun, a community health expert at the College of Medicine, University of Lagos, says extreme heat directly worsens fluid and electrolyte imbalances for people with diabetes and hypertension.

“For hypertensive patients, the additional strain on the kidneys can intensify,” he explains.

Heat also steals movement. In many neighborhoods there are no parks, no green spaces, and no safe time to walk after work. When the sun is up, it is too hot. When it sets, insecurity keeps people indoors. The result is more sitting, less exercise, and blood sugar levels that climb.

Then comes food. Climate change is hitting Nigerian farms from two sides: drought in the north and floods along the rivers and coast. Crop yields drop, food prices rise, and families make hard choices. A basket of tomatoes that sold for ₦8,000 last year now costs double. Fresh vegetables disappear from the table first.

What replaces them is cheap and filling. Instant noodles, soft drinks, salty snacks, and fried foods are everywhere, heavily advertised and often cheaper than fruits. Nutritionists call it the “nutrition transition.” In Nigeria it is happening fast, and it is deadly. Diets high in salt, sugar and unhealthy fats are now a leading driver of non-communicable diseases. Nigerians consume an average of 3.9 grams of sodium daily, nearly double the WHO recommendation of 2 grams.

The numbers tell the story. In 1992, less than 10 percent of Nigerians had high blood pressure. By 2003 it was 35 percent. Today it is about 40 percent — one in every three adults. For diabetes, estimates put 11 million Nigerians living with the condition, and more than 55,000 died from it in 2024 alone. Researchers note that climate change, food production shocks and poor diets together increase the risk of type-2 diabetes and cardiovascular disease.

Aisha Bello in Maiduguri knows this math too well. After floods washed away her farm in 2023, she moved to the city with her three children. Her husband’s salary barely covers rent. “We used to eat beans, greens, and fish from the river,” she says.

“Now it is bread and Milo in the morning, noodles at night. It is what we can afford.” Six months later she was diagnosed with hypertension. Her doctor told her to reduce salt. Salt is the only thing that makes the cheap food taste like food.

The air itself has become part of the problem. Power cuts are daily in most states, so generators roar from 6pm till midnight. Firewood and charcoal are still used for cooking in millions of homes. Public health experts say burning firewood and flaring gas releases particulates that trap heat and pollute the air. Dirty air damages blood vessels and triggers high blood pressure. For people already managing chronic illness, breathing that air every day adds another layer of strain.

In clinics, the third blow is access. When floods come, they do more than destroy crops. They wash away roads, cut off communities, and damage health centers. Patients miss appointments. Those on insulin cannot keep it cold during long blackouts. Professor Osibogun calls climate change a growing public health emergency that must be tackled with proactive policies.

“Climate change is aggravating asthma, hypertension, and diabetes through heat and pollution,” he told Vanguard.

The cost is personal and national. The average Nigerian household now spends about ₦122,000 a year out of pocket on NCD treatment. About 30 percent face catastrophic health spending, and roughly 20 percent are pushed into poverty because of it. When a breadwinner in his 40s or 50s dies, the country loses decades of productivity.

Doctors on the frontline say they are overwhelmed. Cardiology is now one of the fastest-growing specialties because hospitals are seeing a surge in cardiovascular cases. “General practitioners alone cannot cope,” says Femi Stephen of the Federal Ministry of Health.

Yet prevention is still treated as an afterthought. Experts argue that Nigeria must address the “syndemic” — the way climate, food insecurity, and NCDs feed each other. That means clean energy alternatives so people are not forced to burn wood and run generators. It means urban planning that includes parks and safe walkways, not just roads. It means food policies that make healthy food affordable instead of letting ultra-processed products dominate shelves.

On a Tuesday evening in Ibadan, residents watched a free blood pressure screening at a market. The queue was long. A man in his 30s sat down, and the machine read 200 over 120. “Almost a killer,” the pharmacist whispered. He had no idea. He thought hypertension was for old people.

That ignorance is part of the crisis. But so is the environment. You can tell people to eat better and exercise, but when vegetables are expensive, when it is too hot to walk, and when the air outside the clinic is full of generator smoke, advice alone does not work.

Back in Kano, Musa now drinks three litres of water a day, as his doctor advised for heat. He takes his metformin with food, even when food is scarce. He checks his sugar at a pharmacy that charges ₦500 per test.

“I am managing,” he says.
“But I am tired of managing the weather too.”

The clinics are still open. The drugs are still sold. But until the heat eases, until food becomes food again and not a risk factor, and until the air is clean enough to breathe without fear, more Nigerians will keep walking into hospitals with conditions that started, in part, outside the hospital walls.

Onwumere is Chairman, Advocacy Network on Religious and Cultural Coexistence (ANORACC)