What Is Fatigue?

Fatigue is more than normal sleepiness; it is a persistent feeling of physical or mental exhaustion that does not improve even after rest. Some people describe it as:

• low energy,
• weakness,
• body heaviness,
• difficulty concentrating,
• lack of motivation.

Fatigue can develop gradually or suddenly, depending on the cause.

Common Causes of Constant Tiredness

1. Poor Sleep

One of the most common causes of tiredness is inadequate or poor-quality sleep. In many homes, sleep may be affected by late nights, long commutes, shift work, noise, overcrowding, heat, mosquitoes, or power outages (making it hard to cool the room). Using phones for long hours at night or sleeping in a bright room can also reduce sleep quality.

Conditions like insomnia and sleep apnea may also reduce sleep quality. If you snore loudly, stop breathing during sleep (noticed by others), wake up choking, or feel sleepy during the day despite “enough” hours of sleep, it is worth discussing with a healthcare worker.

2. Stress and Mental Exhaustion

Emotional stress, anxiety, and constant worrying can drain both the body and mind. Many people experiencing burnout from work, school, business pressure, or family responsibilities often complain of persistent tiredness.

Mental health conditions such as depression may also cause low energy, loss of motivation, and changes in sleep patterns or sleep disorders.

3. Poor Nutrition

The body needs adequate nutrients to produce energy. Skipping meals, relying mainly on sugary drinks/snacks, or eating a diet low in protein, fruits, and vegetables can contribute to weakness and fatigue. In some communities, food insecurity or restrictive dieting can also lead to undernutrition.

Iron deficiency anaemia (low blood) is particularly common. It may be linked to heavy menstrual bleeding, pregnancy and breastfeeding, low iron intake, frequent blood loss (for example from ulcers), or worm infestation. Anaemia can cause tiredness, dizziness, shortness of breath on exertion, headaches, and paleness.

4. Dehydration

Not drinking enough water can affect circulation, body temperature regulation, and energy levels. In hot climates or during outdoor work, dehydration can occur quickly. Signs include thirst, dark urine, dry mouth, headache, and dizziness. If you have diarrhoea or vomiting, replacing fluids and salts (for example with oral rehydration solution) is important.

5. Infections and Illnesses

Certain illnesses can make the body feel constantly weak or tired. In many African settings, infections and anaemia are common contributors. Examples include:

• Malaria (especially if you have fever),
• Worm infestation leading to anaemia,
• Tuberculosis (TB),
• HIV and other long-term infections,
• Pregnancy-related changes,
• Sickle cell disease and other blood disorders,
• Heart disease (including heart failure) and uncontrolled high blood pressure,
• Diabetes,
• Thyroid disorders,
• Chronic kidney or liver disease.

Because there are many possible causes, it is risky to assume every episode of weakness is “malaria” or “typhoid.” If tiredness keeps returning—especially with fever, weight loss, cough, night sweats, or diarrhoea—try to get tested and reviewed by a clinician.

6. Lack of Physical Activity

Although it may seem surprising, staying inactive for long periods can worsen fatigue. Regular movement helps improve blood circulation, mood, sleep quality, and energy levels. This does not have to mean a gym, walking, stretching, dancing, farming activities, or active household chores can help. Start slowly if you have been unwell, and stop if you develop chest pain, severe dizziness, or shortness of breath.

When Tiredness May Be a Warning Sign

Dr. Anthony Komaroff of Harvard Medical School says "Unusual fatigue is often the first major red flag that something is wrong." 

You should pay closer attention to fatigue if it:

• Lasts for several weeks,
• Becomes severe,
• Interferes with daily life,
• Occurs alongside other symptoms.

Seek medical attention if tiredness is associated with:

• Unexplained weight loss,
• Dizziness,
• Difficulty breathing,
• Chest pain,
• Persistent fever,
• Frequent headaches,
• Fainting,
• Or severe weakness.

These symptoms may indicate an underlying medical condition that requires proper evaluation and management.

African healthcare realities (and how to navigate them)

In many African communities, persistent tiredness is often normalized because of busy work schedules, school demands, financial stress, childcare, long commutes, and physically demanding jobs. Heat exposure and dehydration can also play a role.

It is common to buy medicines from a pharmacy or vendor and treat yourself for malaria or typhoid whenever you feel weak. However, fatigue has many causes, and treating without testing may delay the right diagnosis. If possible, ask for a malaria test when you have fever, and see a clinician if symptoms continue after 2–3 days or keep coming back.

Limited access to healthcare, overcrowded clinics, and costs can make it hard to get checked early. If you attend a clinic, it can help to write down: how long the tiredness has lasted, any fever/weight loss/cough, menstrual pattern (for women), pregnancy possibility, medicines/herbal products you use, and any long-term conditions. Basic tests that may be useful (depending on symptoms and what is available) include haemoglobin (for anaemia), malaria testing, blood sugar, pregnancy test, and urine test.

What Can You Do About Constant Tiredness?

Some simple, affordable lifestyle changes may help improve energy levels:

• Aim for regular sleep hours; reduce phone use before bed and sleep under a mosquito net where needed.
• Eat balanced meals when possible: include protein (beans, eggs, fish, meat, ground nuts), iron-rich foods (beans, liver, dark leafy vegetables), and fruits/vegetables.
• Drink enough fluids, especially in hot weather; increase fluids if sweating a lot. If you have diarrhoea, use oral rehydration solution.
• Manage stress: talk to someone you trust, take short breaks, and seek help if you feel persistently low, hopeless, or anxious.
• Limit alcohol and avoid mixing alcohol with medicines.
• Be careful with stimulants (strong coffee/energy drinks/kola nuts): they may keep you awake and worsen fatigue over time.
• Move your body most days (walking, stretching, active chores), but start slowly if you have been unwell.
• Take breaks when overworked and ask for support when possible.

It is also important to avoid taking medications or supplements unnecessarily without proper medical advice. Avoid repeated use of antibiotics, antimalarials, steroid “energy boosters,” or herbal mixtures for tiredness without testing and review.

When Should You See a doctor?

You should consider seeing a healthcare professional if:

• Tiredness lasts more than 2–3 weeks despite rest and better sleep,
• You have fever, repeated chills/sweats, or you suspect malaria and symptoms do not improve after initial care,
• You have a cough lasting more than 2 months, night sweats, or weight loss (possible TB),
• You may be pregnant or recently delivered and feel unusually weak,
• You have signs of anaemia (paleness, dizziness, fast heartbeat, shortness of breath on exertion),
• You notice other unusual symptoms or the tiredness keeps worsening.

A clinician may recommend tests to identify possible underlying causes and provide appropriate treatment. Depending on your symptoms and what is available, this may include haemoglobin (anaemia test), malaria testing, blood sugar, pregnancy test, stool/urine tests, and sometimes HIV testing (because HIV is treatable, and early diagnosis improves outcomes).