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Low Energy: Causes, Symptoms & Treatments

at Omniya Clinic in London

Feeling constantly tired, foggy, or unmotivated can affect everything – your mood, productivity, and relationships. At Omniya Clinic in Knightsbridge, we understand how draining persistent fatigue can be. Our medical team takes a root-cause approach, looking beyond symptoms to uncover what’s really depleting your energy.

Low energy (also known as fatigue) is common and often has treatable causes. Hormones, thyroid function, nutrition, stress, poor sleep, low iron or B12 levels, and certain medications can all contribute to feeling “run down.”

Your clinician will review your symptoms, lifestyle, and medical history, then create a targeted plan, whether that’s HRT, TRT, thyroid optimisation, nutrition support, or IV therapies, to help you regain energy safely and sustainably.

a man showing symptoms of low energy

What is Low Energy (Fatigue)?

Low energy, often referred to as fatigue, is a persistent sense of physical or mental exhaustion that doesn’t improve with rest. You may feel flat, unfocused, less resilient, and simply “not yourself.”

It’s more than just being tired after a long day. Fatigue can sap motivation, concentration, and emotional balance, affecting how you function and engage with life. While busy schedules or stress can contribute, ongoing low energy usually signals an underlying imbalance that’s worth investigating.

Common contributors include hormonal changes, thyroid dysfunction, nutrient deficiencies, poor sleep, or chronic stress. At Omniya Clinic, we take a medical, root-cause approach to uncover why you’re feeling depleted and create a personalised plan to restore your energy, clarity, and drive.

low energy trt

Common Causes of Low Energy

Low energy can develop for many reasons, from hormonal imbalances and nutritional gaps to lifestyle pressures and medical conditions. Understanding the cause is the first step toward restoring lasting energy and focus.

 

  • Fluctuations in hormones can significantly affect energy, mood, and motivation.
  • Perimenopause and menopause falling oestrogen and progesterone can lead to fatigue, brain fog, and sleep disruption.
  • Low testosterone in men (and sometimes in women) reduces stamina, drive, and muscle strength.
  • Underactive thyroid (hypothyroidism) slows metabolism, often causing persistent tiredness, weight gain, and low mood.
  • Deficiencies and metabolic imbalances can leave the body under-fuelled.
  • Low iron or ferritin, vitamin B12, or vitamin D, essential for oxygen transport, nerve function, and energy metabolism.
  • Insulin resistance or poor blood-sugar control can cause energy dips and brain fog after meals.
  • Dehydration and inadequate protein or fibre intake reduce alertness and endurance throughout the day.
  • Modern lifestyles can drain energy reserves faster than we realise.
  • Poor sleep quality or irregular sleep patterns including sleep apnoea or disrupted circadian rhythm.
  • High stress, anxiety, or low mood activate the body’s stress response, raising cortisol and disrupting rest.
  • Alcohol, smoking, or low physical activity all impact metabolism, recovery, and motivation.
  • Certain health conditions and medications can contribute to chronic fatigue.
  • Infections or post-viral fatigue, including long COVID.
  • Chronic inflammation or autoimmune disorders, which drain cellular energy.
  • Some blood pressure, mood, or allergy medications can have fatigue as a side effect.
  • Diabetes and other long-term conditions that affect metabolism and circulation.
TRT consultation at Omniya Clinic London

Symptoms of Low Energy

Low energy (fatigue) can affect both the body and mind, showing up as more than just tiredness. You might notice changes in focus, motivation, and even how your skin looks and feels. These symptoms can develop gradually, often becoming “the new normal” until energy levels are properly assessed and restored.

Common symptoms of low energy include:

  • Persistent tiredness or “heavy limbs”, with slow recovery after physical or mental effort
  • Brain fog, poor concentration, or forgetfulness
  • Low motivation and drive, especially for activities you once enjoyed
  • Irritability, low mood, or anxiety, often linked to hormonal or metabolic imbalance
  • Headaches, dizziness, or muscle weakness
  • Dark circles, dull skin tone, or a generally run-down appearance

 

These signs may range from subtle to severe and can impact productivity, confidence, and quality of life.

Seek urgent medical help if you experience chest pain, breathlessness at rest, fainting, severe new headaches, or sudden weakness, as these may indicate a more serious underlying issue.

Testosterone Replacement Therapy London (TRT)

What Treatments Are Available For Low Energy?

Self-Care Foundations

When you’re feeling drained, small daily habits make a big difference. Consistent, low-effort changes can help restore balance, stabilise energy levels, and support any medical treatment you’re receiving.

Sleep

Aim for a regular sleep schedule – ideally going to bed and waking up at similar times each day. Create a calming wind-down routine, reduce screen exposure and bright light an hour before bed, and set a caffeine curfew in the afternoon to improve sleep depth and recovery.

Nutrition

Include protein with every meal to stabilise blood sugar, pair it with fibre-rich carbohydrates, and stay well-hydratedthroughout the day. Try to limit alcohol during the week, as even small amounts can disrupt sleep and energy metabolism.

Movement

Gentle, consistent activity improves circulation, metabolism, and mood. Aim for daily low-to-moderate movement – such as walking, yoga, or swimming – and add two strength-training sessions per week if possible to build endurance and support hormone health.

Stress Care

Stress drains energy as much as lack of sleep. Short, frequent breaks work best: try paced breathing, mindfulness, or a brief walk between tasks to reset the nervous system. Little and often goes a long way.

These self-care foundations complement the medical and hormonal treatments available at Omniya Clinic in Knightsbridge, helping you feel clearer, calmer, and more resilient day to day.

TRT Treatment Room

Low Energy FAQs

How do I take HRT?

HRT can be administered in the form of tablets, gel rubbed into the skin or skin patches.

Is TRT an ongoing treatment?

The benefits of the therapy decrease when it is stopped, and TRT is typically advised to be an ongoing treatment.

Is TRT safe for everyone?

Tesosterone replacement therapy treatment shouldn’t be given to individuals with a diagnosis of prostrate or blood cancer. A thorough medical history and investigations will be carried out prior to the commencement of any treatment at Omniya Clinic.

Is low energy just part of getting older?

Not necessarily. Ageing can change hormones and sleep, but persistent fatigue usually has specific, addressable drivers.

How do you test for the cause?

We use targeted bloods (thyroid, iron/ferritin, B12, vitamin D, glucose/HbA1c, hormones where indicated) and a clinical review of sleep, stress and medications via our GP Wellness Check.

When is HRT or TRT appropriate?

When symptoms and test results indicate a hormonal driver and it’s safe for you. Your clinician will discuss benefits, risks and alternatives.

Can IV drips fix fatigue?

They can support hydration and micronutrient status, but long-term improvement comes from addressing the root cause (hormones, thyroid, iron, sleep, stress, metabolism). IVs are an adjunct – not a replacement for diagnosis.

How quickly will I feel better?

Some people notice changes within weeks; deeper hormonal, thyroid or iron corrections can take longer. We review and adjust so progress is steady and sustainable.

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