Daijiworld Media Network - New Delhi

New Delhi, Jul 20: Feeling tired after a sleepless night or a demanding week is normal, but persistent exhaustion despite adequate rest could point to an underlying health issue rather than simply ageing or stress, according to experts.

Dr Pradeep Mahajan, regenerative medicine researcher and founder of StemRx Hospital and Research Centre, said one often-overlooked cause of chronic tiredness is cellular fatigue, a condition in which the body's cells fail to produce sufficient energy to support normal functions.

Mitochondria, commonly known as the "powerhouses" of cells, generate the energy required for every bodily function, from heartbeat and muscle movement to brain activity. When these structures do not function efficiently, energy production declines, leading to ongoing fatigue.

"Cellular fatigue takes place when the cells of your body are unable to produce enough energy to support the body's everyday functions. This mostly happens because of unhealthy mitochondria due to factors like chronic stress, insomnia, unhealthy eating, lack of physical activity and even ageing," Dr Mahajan said.

He noted that people with cellular fatigue often continue to feel drained throughout the day despite getting adequate sleep. Even routine activities such as climbing stairs, concentrating at work or holding conversations may become unusually exhausting.

Experts say fatigue often develops gradually through everyday habits.

Chronic stress can keep the body in a prolonged state of alertness, disrupting recovery and normal cellular function. Poor-quality sleep reduces the body's ability to repair tissues and restore brain function, while a sedentary lifestyle can further weaken stamina by reducing mitochondrial efficiency.

According to Dr Mahajan, declining cellular energy may result in symptoms such as persistent tiredness, brain fog, poor concentration, reduced physical strength and slower recovery after illness or exercise.

Other common symptoms may include difficulty concentrating, forgetfulness, low motivation, irritability, mood changes and feeling physically exhausted after mild activity.

Medical experts caution that these symptoms overlap with several other health conditions, including anaemia, thyroid disorders, infections, nutritional deficiencies, sleep disorders and mental health conditions. Persistent fatigue should therefore be evaluated by a healthcare professional rather than self-diagnosed.

Dr Mahajan warned that prolonged cellular fatigue may be associated with an increased risk of conditions such as diabetes, cardiovascular disease, chronic fatigue syndrome, neurodegenerative disorders, autoimmune diseases and depression, while also accelerating the ageing process.

However, he emphasised that fatigue alone does not necessarily indicate that a person will develop these illnesses, but may reflect underlying biological processes that warrant medical assessment.

The field of regenerative medicine is exploring therapies aimed at improving cellular energy production.

Dr Mahajan said approaches such as microdose infusion therapy, NAD? therapy, exosome therapy, red light therapy, physiotherapy and rehabilitation seek to enhance mitochondrial function, promote cellular repair and improve overall vitality. He also cited peptide-based therapies designed to support tissue healing, cognitive function, stress resilience and metabolic health.

However, experts note that while treatments such as supervised exercise programmes, rehabilitation and red light therapy have established roles in certain medical conditions, many regenerative therapies—including exosome therapy, several peptide treatments and NAD? infusions—are still under scientific investigation for fatigue.

Current clinical evidence remains limited, and regulatory approval for these treatments varies across countries. Individuals considering such therapies are advised to consult qualified medical specialists and rely on evidence-based guidance rather than unverified claims.

Experts recommend that the first step in addressing persistent fatigue should be strengthening the foundations of health through adequate sleep, stress management, a balanced diet, regular physical activity and timely medical evaluation.

"Chronic exhaustion should not be considered normal in today's world. Cellular fatigue is often a warning sign that the body's energy systems are struggling and this condition needs timely attention. People experiencing persistent fatigue or lack of energy should seek expert medical guidance," Dr Mahajan said.