When your mood seems to have a mind of its own

Some days the change is obvious: you feel flat, snappy or tearful, and you can name the reason. Other times the shift seems to come from nowhere. Focus slips, sleep goes off track, small things feel overwhelming, and you wonder what happened to your usual self.

Mood is shaped by many things, including stress, sleep, relationships, health conditions and life events. Hormones are one important piece of that picture. They are chemical messengers that travel through the blood and influence almost every system in the body, including the brain. When hormone levels shift, whether through natural life stages or a medical condition, it can show up in how you think and feel.

This article explains the main hormones involved, the signs that a hormonal factor might be worth checking, and how to start the conversation with a clinician.

If you are in crisis or thinking about harming yourself, call or text 988 in the US to reach the 988 Suicide & Crisis Lifeline, available 24 hours a day. Outside the US, call your local emergency number.

The hormones most often involved

Cortisol and the stress response

Cortisol is released by the adrenal glands in response to stress. In short bursts it helps you respond to challenges. When stress is prolonged, the stress system can stay activated, which many people experience as feeling wired but tired, poor sleep, irritability, and difficulty concentrating. Rarely, conditions that cause too much or too little cortisol can affect mood and energy, and these need medical assessment.

Thyroid hormones

The thyroid gland in the neck controls the pace of many body processes. An underactive thyroid (hypothyroidism) can cause low mood, tiredness, slowed thinking, feeling cold, weight gain and constipation. An overactive thyroid (hyperthyroidism) can cause anxiety, restlessness, a racing heart, trouble sleeping, heat intolerance and weight loss. Thyroid problems are common and can be checked with a simple blood test.

Estrogen and progesterone

These hormones fluctuate across the menstrual cycle, during pregnancy and after birth, and through perimenopause and menopause. Many people notice mood changes linked to these shifts. Some experience premenstrual syndrome (PMS), and a smaller number have a more severe form called premenstrual dysphoric disorder (PMDD), which can cause intense mood symptoms in the week or two before a period. Perimenopause can bring irritability, anxiety, low mood, sleep problems and brain fog. After childbirth, low mood that lasts beyond the first couple of weeks may be postpartum depression and deserves prompt support.

Testosterone

Testosterone affects energy, mood, motivation and sex drive in all genders. In men, levels that are clearly low for medical reasons can contribute to fatigue and low mood, though these symptoms have many other possible causes too.

Blood sugar and insulin

Swings in blood sugar can affect concentration and mood, and people with diabetes may notice irritability or confusion when levels are too high or too low.

Signs a hormonal factor may be worth checking

• Mood changes that follow a clear monthly pattern
• New anxiety, low mood or irritability during perimenopause or after having a baby
• Mood changes along with physical signs, such as unexplained weight change, feeling unusually hot or cold, hair or skin changes, a racing heart, or changes in periods
• Fatigue that does not improve with rest
• Brain fog or trouble focusing that is new for you
• Sleep problems that started alongside other body changes

These signs do not mean hormones are definitely the cause. Depression and anxiety disorders are common on their own, and they deserve care whether or not hormones are involved. Vitamin deficiencies, anemia, sleep disorders, medicines and other conditions can also cause similar symptoms. That is why a proper assessment is useful.

Getting the right checks

A good first step is a conversation with a primary care clinician. It helps to bring:

• A short record of your mood, sleep and energy over a few weeks, and how they line up with your menstrual cycle if relevant
• A list of physical symptoms, even ones that seem unrelated
• All medicines and supplements you take
• Any family history of thyroid disease, diabetes or mood disorders

Depending on your symptoms, a clinician may suggest blood tests, such as thyroid function, blood count, vitamin D, vitamin B12 and folate, iron, blood sugar, or specific hormone levels. Some hormone tests need to be taken at particular times of day or points in the menstrual cycle, so follow the instructions you are given.

If getting a timely appointment is difficult, telehealth services can be one way to start. One option some readers use is Sesame, a direct-to-patient telehealth platform where you can book visits with clinicians, including mental health providers, see prices upfront, and pay without insurance. It may suit people who want to get started quickly; check that the service and any tests fit your situation, and keep your regular doctor informed.

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Everyday habits that support a steadier mood

Whatever is behind your symptoms, these foundations help many people:

• Regular sleep and wake times, with a wind-down routine
• Regular meals that include protein, fiber and healthy fats, to avoid big energy dips
• Daily movement, even a short walk outdoors
• Limiting alcohol and caffeine, which can disrupt sleep and mood
• Stress outlets, such as breathing exercises, time in nature, or creative activities
• Connection, by staying in touch with people who make you feel supported

When to get help quickly

• Thoughts of suicide or self-harm: call or text 988 in the US, or your local emergency number
• Low mood after childbirth that is severe, or any thoughts of harming yourself or your baby
• Confusion, extreme agitation, or seeing or hearing things others do not
• A racing heart with chest pain, fainting or shortness of breath

See a clinician soon if low mood or anxiety lasts more than two weeks or is affecting your work, relationships or self-care.

The takeaway

Hormones such as cortisol, thyroid hormones, estrogen, progesterone and testosterone can influence mood, sleep, energy and focus. If your mood changes come with physical symptoms or follow a pattern, it is worth asking for an assessment. Mental health symptoms deserve care in their own right, whatever the cause.

If your mood changes come with aches or physical pain, the free Pain Check-Up can help you keep track of them.