What Causes Hair Loss and How Do I Stop It?

Understanding the Reasons Behind Thinning, Shedding and Receding Hair

Hair loss is common among both men and women, and it can appear in many different ways. Some people notice gradual thinning, others experience increased shedding, and some see changes to their hairline or parting.

Understanding what causes hair loss is the first step toward deciding how to manage it, whether that involves lifestyle adjustments, medical assessment or a long-term treatment plan. At Atlantis Medical, we focus on clear, evidence-based guidance to help clients understand why hair loss happens and what options may be suitable for their individual needs.

Common Causes of Hair Loss

Genetics and pattern hair loss

Genetic factors are one of the most common reasons for thinning hair. Follicles that are sensitive to hormones such as DHT gradually produce finer, shorter strands over time. Men often experience recession at the temples or crown, while women typically notice a wider parting or diffuse thinning across the scalp.

Hormonal changes

Hormonal fluctuations can disrupt the normal growth cycle and lead to shedding. Changes related to thyroid conditions, pregnancy, menopause or adjustments in medication may all influence how the follicles behave. These shifts can cause gradual thinning or noticeable short-term shedding depending on the underlying cause.

Stress-related shedding

High levels of physical or emotional stress can trigger telogen effluvium, a temporary condition where more hairs enter the resting phase at once. This often leads to sudden, diffuse shedding that becomes noticeable a few months after the stressful event. The shedding usually settles once the trigger is resolved, although recovery can take time.

Nutritional deficiencies

Low levels of iron, vitamin D, zinc or protein can affect how well the follicles function. When the body is not receiving enough essential nutrients, the hair growth cycle may slow, and density may decrease. Addressing these deficiencies often helps support the return of healthier growth patterns.

Lifestyle habits

Long-term habits such as poor sleep, smoking and high alcohol intake may contribute to hair thinning for some people. These factors can influence circulation, hormonal balance and general wellbeing, all of which play a role in the hair cycle. Improving daily routines and reducing stress may help reduce ongoing shedding.

Medical conditions and medications

Health conditions such as thyroid disease, autoimmune disorders and chronic illness can affect the natural growth cycle. Certain prescribed medicines may also cause temporary or ongoing shedding as a side effect. Identifying and managing the underlying medical cause is an important part of restoring stability to the hair cycle.

Haircare and chemical damage

Over-processing, frequent heat styling or harsh chemical treatments can weaken the hair shaft and contribute to breakage and thinning. Tight hairstyles can also place strain on the follicles and lead to traction-related loss. Adjusting styling habits and choosing gentler products can help protect the hair.