When a patient tells me they are grieving, I try to convey something that most people do not know: grief is not primarily a psychological experience. It is a physiological one. The pain of loss is not metaphorical — it is neurological. The exhaustion is not weakness — it is biological. The physical symptoms people experience in bereavement are real, measurable, and have documented physiological mechanisms.
I say this because I regularly encounter grieving people who are bewildered and sometimes ashamed of how their body is responding — who expect themselves to be sad and functional, and find instead that they cannot concentrate, cannot sleep, cannot eat, cannot stop sleeping, have chest pain, have a racing heart, keep forgetting things. Who wonder if something is wrong with them.
Nothing is wrong with them. Their body is responding precisely as it was designed to respond to catastrophic loss.
What grief does to the body
The heart: "Broken heart syndrome" (Takotsubo cardiomyopathy) is a real medical condition. A sudden emotional shock — including bereavement — can trigger a surge of stress hormones that temporarily stuns the heart muscle, causing symptoms virtually indistinguishable from a heart attack: chest pain, shortness of breath, and ECG changes. It is most common in women over 50. It is almost always temporary and recovers without lasting damage — but it requires urgent medical assessment. If you have chest pain in the context of acute grief, call 999.
Beyond Takotsubo, bereavement is associated with significantly increased cardiovascular risk in the weeks and months following a loss. The "widowhood effect" — the increased mortality rate in recently bereaved spouses — is well-documented and partly explained by this cardiovascular vulnerability.
The immune system: Grief suppresses immune function. Bereaved people have measurably reduced natural killer cell activity, lower lymphocyte proliferation, and elevated inflammatory markers. This translates to greater susceptibility to infections — the pattern of bereaved people developing colds and flu is not coincidence.
Sleep: Grief profoundly disrupts sleep. Difficulty falling asleep, frequent waking, nightmares involving the deceased, and early morning waking are all common. Sleep deprivation then compounds every other aspect of the grief experience — mood, concentration, immune function, emotional regulation.
The brain: Grief activates the brain's reward and craving systems — the same systems involved in addiction. This is partly why grief feels like yearning, like an ache for the person who is gone. Neuroimaging studies show that viewing photographs of the deceased activates both pain processing regions and reward regions simultaneously.
Concentration and memory: What is sometimes called "grief brain" — difficulty concentrating, forgetting things, making simple errors — is neurological. Cortisol (the stress hormone, elevated in grief) impairs hippocampal function, the memory and concentration centre of the brain.
The gut: The gut-brain axis means that psychological states directly affect gastrointestinal function. Grief is commonly associated with nausea, loss of appetite, or conversely comfort eating, constipation or diarrhoea, and abdominal pain.
How grief varies across cultures — and why this matters clinically
Grief is universal. How it is expressed and how long it is expected to last is culturally specific. This matters enormously in a clinical context because healthcare providers trained primarily in Western cultural frameworks may pathologise grief expressions that are normal within African cultural contexts — and vice versa.
In many African cultures, grief is expressed collectively and demonstrably. Wailing, physical prostration, and extended mourning periods are normal and expected. The concept of moving on quickly — returning to normal functioning within weeks — is not culturally consonant.
Conversely, in African cultures where mental health discussion is stigmatised, grief that has become clinical depression may be attributed to spiritual causes, treated with prayer alone, or simply endured without recognition that support is available and appropriate.
Understanding your own cultural framework for grief — and communicating it to healthcare providers if you seek help — is important.
Case study: Farai's bereavement
Farai, 52, lost his mother in Zimbabwe in April 2024. He was unable to travel for the funeral due to work commitments and had not been home in four years. The combination of loss, guilt about not being present, and inability to participate in the mourning rituals his culture expected created a bereavement that was both acute and complicated.
He came to see me six months later. He was not sleeping. He was drinking significantly more than usual — a glass of wine had become a bottle most evenings. He had lost 8kg. He was withdrawn from his family in the UK. He described waking at 3am most nights and being unable to return to sleep.
He did not present this as grief. He presented it as "stress" and "not coping." It took a careful history to understand what was underneath.
What Farai was experiencing was grief with complicating features: geographical distance from his community and the rituals that enable collective mourning, guilt about absence, and the added complexity of disenfranchised grief — grief that does not receive social recognition because it is not immediately visible to those around him.
We worked together on several levels: addressing the alcohol as a maladaptive coping mechanism, referring him to a therapist experienced with cultural bereavement, and — importantly — helping him find a way to participate belatedly in mourning rituals through a ceremony with his family in the UK.
"I thought I was supposed to have moved on," he told me. "Nobody in my office even knew my mother had died."
Normal grief vs complicated grief — knowing the difference
There is no timeline for grief. Expecting someone to be "over it" by a specific point is unhelpful and clinically unsound. However, there are features that suggest grief has become what is now termed Prolonged Grief Disorder (PGD), which benefits from specific treatment:
| Normal grief | Prolonged Grief Disorder |
|---|---|
| Intense but variable — comes in waves | Persistent, relatively constant high intensity |
| Slowly reduces in intensity over months | Remains severe beyond 12 months (6 months in some criteria) |
| The bereaved person can function, with difficulty | Significant functional impairment persists |
| The bereaved can imagine a future | Inability to imagine a future without the person |
| Can still experience positive emotions | Profound, persistent inability to experience positive emotion |
PGD is not the same as depression, though they frequently co-occur. It has specific psychological treatments — particularly Complicated Grief Treatment (CGT) and Prolonged Grief Disorder Therapy — that are distinct from standard CBT for depression.
Physical symptoms that warrant a GP visit
While most physical symptoms of grief are expected and self-limiting, see your GP if you experience:
- Chest pain or palpitations (rule out cardiac causes)
- Weight loss greater than 5% of body weight
- Persistent insomnia beyond 2–3 months
- Symptoms of depression (low mood, loss of interest, hopelessness) lasting more than 2 weeks
- Thoughts of self-harm or suicide
Sources: Shear MK, NEJM 2015 (Prolonged Grief Disorder); Eisenberger NI, Science 2003 (social pain neural pathways); Buckley T et al, Journal of the American College of Cardiology 2010 (cardiovascular effects of bereavement); Bartrop RW et al, The Lancet 1977 (immune suppression in grief); Prigerson HG et al, PLOS Medicine 2009 (diagnostic criteria for complicated grief); WHO ICD-11 — Prolonged Grief Disorder definition.