Hair fall often comes back because the cause was never found. Oils, serums and shampoos act on the scalp and hair, but they cannot correct low iron, a thyroid problem, hormonal changes or a crash diet. When the trigger continues, the shedding usually returns.
How much hair fall is normal?
Losing around 50 to 100 hairs a day is usually normal, because hair grows in cycles and old strands are replaced. It is worth paying attention if you see much more hair than usual on the pillow or in the drain, a widening parting, a thinner ponytail, or a receding hairline.
Why does hair fall start months after the trigger?
This surprises most people. After a stress on the body, many hairs move into their resting phase together and shed about two to three months later. This is called telogen effluvium. By then, the fever, illness, childbirth, surgery or crash diet may feel long past, so the link is easily missed.
This type of shedding often settles once the trigger has passed, although it can take several months, and regrowth takes longer still. Hair grows only around one centimetre a month.
What are the common causes?
- Low iron or haemoglobin, common in Indian women
- Thyroid problems, both overactive and underactive
- Hormonal changes, including PCOD, pregnancy, childbirth and perimenopause
- Illness and recovery, such as viral fevers and dengue
- Crash diets or too little protein
- Long-term stress and poor sleep
- Some medicines
- Family pattern hair loss, which causes gradual thinning rather than sudden shedding
- Tight hairstyles and repeated chemical treatments
Often more than one of these is happening at the same time.
Which tests may be needed?
There is no fixed list, and tests should fit your history. A doctor may suggest a blood count, ferritin (the body's iron stores), thyroid tests, and sometimes vitamin B12, vitamin D or hormone tests. Ferritin in particular can be low even when haemoglobin looks normal. The hair fall treatment page explains how the assessment works.
Do oils and hair-fall shampoos help?
A shampoo keeps the scalp clean and an oil may improve how hair feels, but neither corrects a deficiency or a hormonal problem. Be careful with products that promise fast regrowth. Hair follows its own growth cycle, and no product changes the fact that visible change takes months.
Does dandruff cause hair fall?
Dandruff does not usually destroy hair roots, but an itchy, inflamed scalp can add to shedding, and scratching can break hair. It is worth treating, alongside anything else that is going on.
What can you do at home?
- Eat enough protein, and avoid sudden crash diets.
- Handle wet hair gently, and avoid very tight hairstyles.
- Limit heat styling and repeated chemical treatments.
- Take supplements only on advice. Extra vitamins do little unless you lack them, and too much of some can harm.
When should you see a doctor?
Get checked if the shedding lasts more than a couple of months, if you see round bald patches, if the scalp is red, painful or scaly, or if you also have tiredness, weight change or irregular periods. Children with hair loss should always be seen.
Early assessment matters because thinning hair usually responds better than areas that have been bare for years. Finding out why it is happening is the most useful first step.
