Why Am I Always Tired? Common Causes of Fatigue in Women

Feeling tired all the time is not normal. And for many women, it is not simply a matter of being too busy. If you find yourself constantly exhausted, relying on caffeine to get through the day, or waking up tired no matter how much sleep you get, you are not alone.

Fatigue in women is incredibly common, but that does not mean it should be ignored. Dr. Delgado is addressing one of the most frequent concerns she sees in practice: ongoing, persistent fatigue. From iron deficiency and low B12 to poor sleep, chronic stress, perimenopause, and menopause, there are many possible reasons why you may feel exhausted all the time.

The key thing to understand is this: fatigue is a symptom. And symptoms deserve attention.

Fatigue Is Not Something You Should Simply Push Through

Many women normalise exhaustion because life is demanding. Work, family responsibilities, hormonal changes, and disrupted sleep often become accepted as part of everyday life. But persistent fatigue is your body’s way of telling you something may be out of balance.

Feeling constantly tired can affect:

• Mood and emotional resilience
• Memory and concentration
• Sleep quality
• Hormonal balance
• Energy levels and exercise tolerance
• Overall wellbeing

Rather than masking symptoms, the aim should be to identify the root cause.

Common Causes of Fatigue in Women

Iron Deficiency and Anaemia

Iron deficiency is one of the most common causes of fatigue in women, particularly during the reproductive years. Heavy periods, dietary factors, digestive issues, or poor absorption can all contribute to low iron levels.

Symptoms may include:

• Constant tiredness
• Dizziness
• Headaches
• Shortness of breath
• Hair thinning
• Feeling weak or drained

Even mild iron deficiency can significantly impact energy levels, and it is often overlooked until levels become quite low.

Quick Tip: If you suspect low iron, ask your GP for a full blood count and ferritin test. Ferritin measures your iron stores and can reveal deficiency even when standard haemoglobin levels appear normal.

Low Vitamin B12

Vitamin B12 plays an essential role in energy production and nervous system function. Low B12 levels can develop gradually, which means symptoms are sometimes dismissed or go unnoticed for extended periods.

Signs of B12 deficiency may include:

• Persistent fatigue
• Brain fog and poor concentration
• Tingling sensations in the hands or feet
• Muscle weakness
• Low mood

Poor Sleep Quality

Many women are sleeping but not truly resting. Stress, anxiety, hormonal fluctuations, blood sugar imbalance, chronic pain, and disrupted sleep patterns can all affect the quality of sleep. This means you may wake feeling exhausted despite spending enough hours in bed.

If you regularly wake feeling unrefreshed, it is worth investigating further rather than simply accepting it as your normal.

Perimenopause and Menopause

Hormonal changes during perimenopause and menopause can have a significant impact on energy levels. Shifts in oestrogen and progesterone may contribute to:

• Fatigue and low energy
• Night sweats disrupting sleep
• Brain fog
• Anxiety and mood changes

Many women are told these symptoms are simply part of ageing. While hormonal changes are a natural process, that does not mean the symptoms should be dismissed or left unsupported. There are options available, and you deserve to have them explored.

Chronic Stress and Burnout

Long-term stress places significant strain on the nervous system and the body as a whole. Many women continue functioning while feeling physically and emotionally depleted. Over time, this chronic stress response can contribute to ongoing exhaustion, poor sleep, low mood, and reduced resilience.

Burnout does not always look dramatic. Sometimes it simply feels like never properly recovering, no matter how much rest you get.

Quick Tip: Burnout and chronic stress can mimic or worsen nutritional deficiencies. If you have been under prolonged pressure, it is worth asking your doctor to check your B12, iron, vitamin D, and thyroid function alongside any lifestyle factors.

Why Persistent Fatigue Should Be Investigated

Fatigue is common, but it should never be considered normal or inevitable. Your body is constantly communicating with you, and ongoing exhaustion may be linked to nutritional deficiencies, hormonal changes, stress, sleep issues, inflammation, or other underlying health concerns.

The goal is not simply to manage symptoms temporarily. The goal is to understand why they are happening in the first place, so that the right support can be put in place.

You Deserve to Feel Like Yourself Again

If you have been asking yourself, “Why am I always tired?”, please know that you do not need to simply accept feeling exhausted every day. With the right support and proper investigation, it is often possible to identify the underlying cause and begin addressing it effectively.

Feeling well, energised, and clear-headed should not feel out of reach. If persistent fatigue is affecting your quality of life, speak to a healthcare professional who will take your symptoms seriously and help you find answers.

Frequently Asked Questions

Is it normal to feel tired all the time as a woman?

Fatigue is very common in women, but it is not something you should simply accept as normal. Persistent tiredness is a symptom that often has an identifiable cause, such as iron deficiency, low B12, hormonal changes, or chronic stress. It is worth speaking to a healthcare professional if fatigue is affecting your daily life.

What blood tests should I ask for if I am always tired?

A good starting point is a full blood count, ferritin (iron stores), vitamin B12, folate, vitamin D, and thyroid function tests. If you are in the perimenopause or menopause age range, hormone levels may also be worth checking. Your GP can advise on which tests are most appropriate for your situation.

Can perimenopause cause extreme fatigue?

Yes. Hormonal changes during perimenopause and menopause, particularly shifts in oestrogen and progesterone, can significantly affect energy levels, sleep quality, and mood. Many women experience fatigue as one of the first signs of perimenopause, often alongside brain fog, night sweats, and anxiety.

How is fatigue caused by iron deficiency treated?

Treatment depends on the severity of the deficiency and its underlying cause. Options may include dietary changes to increase iron intake, oral iron supplements, or in some cases further investigation into absorption issues. It is important to confirm iron deficiency through blood tests before starting supplementation.

Can stress really make you physically exhausted?

Yes. Chronic stress activates the body’s stress response over a prolonged period, which can deplete energy reserves, disrupt sleep, affect hormone balance, and contribute to burnout. Physical exhaustion is a very real consequence of long-term psychological and emotional stress.