When tiredness becomes a permanent state
Tiredness is a normal signal from the body: it indicates that we need rest and recovery. However, if the feeling of exhaustion lasts for weeks, cannot be remedied even by sufficient sleep, or noticeably affects everyday life, a closer look is worthwhile. Persistent tiredness is one of the most common reasons why patients consult a doctor – and in many cases a specific cause can be identified.
In this article we provide an overview of typical triggers, possible warning signs and sensible steps for assessment.
Constant tiredness – an overview of causes
The range of possible triggers is wide. Often several factors interact. The most important areas include:
1. Lifestyle and sleep
- Lack of sleep or irregular sleep: Adults usually need seven to nine hours of sleep. Those who consistently sleep less build up a "sleep debt".
- Poor sleep quality: Frequent waking, snoring or nocturnal pauses in breathing (sleep apnoea) can prevent restful sleep.
- Lack of exercise: Paradoxically, too little movement often leads to more tiredness, not less.
- Diet: A one-sided diet, frequently skipping meals or too much sugar can contribute to energy slumps.
- Alcohol and caffeine: Both can considerably disturb sleep and alertness.
2. Psychological strain
- Stress and feeling overwhelmed at work or in private life
- Depressive moods often manifest as listlessness and exhaustion, sometimes even before the mood itself becomes noticeable
- Anxiety disorders and chronic tension
- Burnout-like states with emotional exhaustion
3. Iron deficiency and other deficiencies
Iron deficiency is one of the most common organic causes of persistent tiredness – particularly in women of childbearing age, during pregnancy, with a vegetarian or vegan diet, and with chronic blood loss (e.g. heavy menstrual bleeding).
Typical symptoms of iron deficiency may include:
- persistent tiredness and reduced performance
- difficulty concentrating
- pallor of the skin and mucous membranes
- brittle nails, hair loss
- cracked corners of the mouth
- headaches, dizziness
- shortness of breath on exertion
A deficiency of vitamin B12, folic acid or vitamin D can also present in a similar way.
4. Thyroid disorders
An underactive thyroid (hypothyroidism) slows the metabolism and often leads to:
- tiredness and lack of drive
- sensitivity to cold
- weight gain despite an unchanged diet
- dry skin and hair loss
- low mood
An overactive thyroid can also cause exhaustion – through inner restlessness and sleep disturbances.
5. Chronic and acute illnesses
- Diabetes mellitus, especially with poorly controlled blood sugar
- Heart and lung diseases with reduced oxygen supply
- Kidney or liver diseases
- Infections, such as a viral infection some time ago or chronic inflammation
- Autoimmune diseases such as rheumatoid arthritis
- Tumour diseases – rarer, but important to rule out
- Post-COVID or long-COVID symptoms with persistent exhaustion
6. Medications
Some medicines can cause tiredness, for example certain blood pressure or allergy medications, sedatives and sleeping aids, or painkillers. Interactions between several preparations may also play a role.
When is a medical assessment of exhaustion advisable?
Occasional tiredness is part of life. However, a medical assessment may be advisable if:
- the exhaustion lasts longer than two to four weeks
- you do not feel rested despite sufficient sleep
- the tiredness noticeably affects daily life, work or family
- additional symptoms appear, such as weight loss, fever, night sweats, breathlessness, palpitations, pallor, digestive problems or persistent low moods
- you have the feeling that "something is not right"
In the case of suddenly occurring, pronounced weakness, chest pain, neurological symptoms or shortness of breath, medical help should be sought immediately.
How an assessment typically proceeds
A structured assessment begins with a detailed conversation and a physical examination. Further steps are then selected in a targeted manner based on this.
History (conversation)
- onset, duration and course of the symptoms
- sleep habits, occupation, demands
- diet, exercise, stimulants
- previous illnesses, medications, family history
- mental state
Physical examination
- blood pressure, pulse, heart and lungs
- skin, mucous membranes, lymph nodes
- thyroid, abdominal organs
Laboratory diagnostics
Blood values that are often useful include:
- full blood count (to rule out anaemia)
- iron status (ferritin, transferrin saturation)
- thyroid values (TSH, possibly fT3, fT4)
- blood sugar and HbA1c
- liver and kidney values
- vitamin B12, folic acid, vitamin D
- inflammatory markers (CRP, ESR)
Depending on the findings, further investigations may follow, such as an ECG, a thyroid ultrasound, a sleep assessment or referral to a specialist.
What you can do yourself
Even without a medical diagnosis, it is worth taking a closer look at your lifestyle:
- Regular sleep rhythm: as far as possible the same times for going to bed and getting up
- Sleep hygiene: a cool, dark bedroom, less screen time in the evening
- Movement in daily life: even brisk walking has a positive effect on energy levels
- Balanced diet: sufficient protein, vegetables, wholegrain products, enough fluids
- Schedule breaks: short recovery phases rather than continuous strain
- Stress management: relaxation techniques, breathing exercises, social contacts
These measures can have a complementary effect, but in the case of long-standing symptoms they are no substitute for a medical assessment.
Conclusion
Persistent tiredness is a common but non-specific symptom. It can be caused by harmless lifestyle factors that are easy to influence – just as well as by conditions requiring treatment, such as iron deficiency or a thyroid disorder. A structured assessment with a conversation, examination and targeted laboratory diagnostics helps to narrow down the causes and plan sensible next steps. Anyone who feels that the tiredness does not fit their own life situation or has lasted too long should take it seriously.
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This article does not replace medical advice.