Diseases that Cause
Hair Loss 

There are many diseases that cause hair loss. Some of them from stress, others autoimmune diseases. While others are related to hormonal imbalances and vitamin deficiency. The causes seem countless. For a more complete information about the causes of hair loss, click here.   

Why analyze diseases that cause hair loss? 

What would we say, to add to a list of problems we already have, to contract a painful, debilitating or even disabling disease? What would we say if apart from that, this disease was the main cause of our hair loss? The only thing we can say is that, it would be frustrating, discouraging and anguishing.

So far, we have only seen the dark side of this. But bringing it to the positive side, it is good to know what really causes our hair loss.

May be you are asking now: "Why is important to analyze the diseases that cause hair loss?" Because that way, we can better understand each of them and counteract the cause.

You will see a series of dots that represents each and every one of those diseases. The great majority cause the hair to fall, but some of them not directly. Here is the list:


Can allergies be the cause of hair loss? Unfortunately, allergies are among the diseases that cause hair loss. But only certain types, not the majority of allergies.

For example, some usually dye their hair, of course for a good looking appearance. The least they imagine is that there is a chemical in those dyes that causes hair loss. This chemical is called Para Phenylenediamine, or PPD and are present in two thirds of all dyes out there.

So, the use of some dyes creates an allergy that causes the hair to fall out. But the vast majority of allergies, do not. Therefore, allergies per se are not diseases that cause hair loss.

According to The Belgravia Centre, the link between a food allergy and hair loss is remote. If by coincidence someone looses hair loss having an allergy with food, then there could be a good number of reasons behind that.

First, many of those who suffer from allergies, also have hormonal imbalance such as thyroid diseases and adrenal disorder, which are often related to the loss and thinning of hair.

In addition, individuals with food allergy symptoms might possibly well not have enough vitamins, minerals or nutritional supplements. If a lack of any of these occurs, it could affect hair development.

Stress may be just another contributing factor, which will often cause temporary baldness. Some believe there is a relationship between the symptoms of food allergy and alopecia areata. Both are autoimmune ailments. Diseases that cause hair loss or are prone to do it.

Alopecia Areata

Alopecia areata or alopecia circumscripta is an autoimmune disease. This causes hair loss in certain areas of the scalp.

But why is alopecia areata among the diseases that cause hair loss? Being an autoimmune condition, instead of the body protecting itself from infections, it attacks the hair follicles of the scalp.

Although alopecia areata is often noticed in round patches of hair loss, at other times the loss is in the entire head. When this is the case, it is called alopecia areata totalis. When the loss of hair is in the whole body, it is known as alopecia areata universalis.


Iron in the blood is necessary for the production of red blood cells. These in turn, carry oxygen to the different cells of the body. If there is an iron deficiency, it would lead to anemia. The result is that less oxygen is taken to the scalp.

When that happens, the body goes into survival mode. Then, it is a priority of our system to keep the vital organs. That makes the body stops sending oxygen to what is not so vital, such as hair for instance, instead of keeping it intact.

That's like the ships of ancient times and some modern ones too. If the ship was on the high seas and faced a storm, the sailors would throw overboard what they did not think are essential. They only would keep what they consider most valuable, like human beings, for example. 

Well, the same happens with our body. Remember that our body system has a brain for itself. When our body detects that red blood cells are decreasing, then they turn on the alarm.

From that moment, they concentrate on bringing nutrients to our vital organs such as heart, brain, liver, etc. Then everything else is thrown overboard, including hair, considering it a luxury. That's why anemia is in the list of the diseases that cause hair loss.

The contrary is also true. When a patient with low iron blood levels is treated also the hair loss is less, and the scalp mis better prepared to regrow more hair, as WebMD stated.


Dandruff is not a contagious or an infectious disease, but is one of the diseases that cause hair loss. Not so directly though.

The condition impacts roughly 50 percent of folks around the world, so if you are suffering this, you're not alone with this issue.

This skin illness can cause the scalp to begin flaking, even be bloated and red. It can also make your scalp feel dry and itchy.

In the majority of instances, dandruff does induce hair thinning.  Nevertheless, it would result in the urge to scratch. This will harm your hair follicles, and leading to your hair loss or thinning, even though maybe not absolute loss.   

Additionally, dandruff may boost hair loss in people with androgenic alopecia, a state which creates male and female pattern baldness.

For sure, it would be awkward to see us with less hair, or not hair at all, which for any individual can translate in not looking or feeling attractive. This would hurt also our self esteem.


Diabetes is a disease that occurs when someone has high blood glucose levels. There are two kinds, type 1 or 2. Type 1 is an autoimmune disease. What does that mean? That the one who has it, is likely to develop a condition called alopecia areata, in which the white blood cells attack the hair follicles, instead of protecting them, as it is supposed to be. To read more on why diabetes appear on the list of diseases that cause hair loss, click here.


Pains and tension, or stress are related to hair loss. Therefore, if we say there is a connection between stress and hair loss, the same happens for headaches. Especially, tension headaches.

You can go to the article Hair Loss and Headache, if you need a more complete explanation why headaches are linked to stress and hypothyroidism, and therefore to hair loss. 

Hypo and Hyperthyroidism

There is a link between thyroid and hair loss.  When someone has, either hypo or hyperthyroidism, hair may fall out and see changes in the texture of your hairThis leads to a mixture of emotions, ranging from fear, anxiety, frustration, even anger.

With a thyroid disease you are also in a greater risk to suffer from alopecia areata. If you have a thyroid problem plus hair loss, and want to know more, click here. 


Lupus is another of the diseases that cause hair loss. Although lupus itself is not contagious, it can cause damage to the organs of the body and pain and complications in the skin. Some of these complications cause permanent hair loss, if the appropriate measures are not taken.

There are four kinds of lupus:

            ·    Systemic Lupus Erythematosus or SLE-It is a class of lupus that affects different organs of the body. It is difficult to detect, because there is no specific study that does.

            ·    Discoid Lupus Erythematosus-This type of lupus causes a chronic irritation in the form of discs, especially in the scalp. Hence its name discoid lupus. In that disc, after the irritation, some scars are formed, where the hair does not grow back, once it is lost. If you want to know more click here.

            ·    Subacute Cutaneous Erythematosus-This type of lupus forms sores and inflammation in the skin, when the one that has it is exposed to the sun.

            ·    Drug Induced Lupus-The name says it all. It is a type of lupus that is caused by drugs or medications.

Those are the four kinds of lupus, which are part of the diseases that cause hair loss. Lupus makes the hair on the scalp thin, although only a few loose large amounts of hair.

In the case of discoid lupus, it forms discs with a rash, which not only causes the hair to be lost in those areas, but if it is not treated in time, scars are formed in which the hair does not grow back.

It's like when you put a branding iron on the cows, to identify them. Where it is marked, hair doesn't grow back, and therefore hair loss becomes permanent.

In the same way the discoid lupus, if not treated in time makes the same effect on the scalp. When the hair is lost and the scar is formed, it cannot be recovered again. That's why it's important to see your doctor as soon as you see any of the symptoms.

Polycystic Ovarian Syndrome or PCOS

(PCOS) or polycystic ovary syndrome is an endocrine disorder that impacts the way the female's ovaries works. PCOS affects 10 million women around the world. Studies have shown that 67% of women suffering from baldness or hair loss also have polycystic ovarian syndrome.

Some of the symptoms are:

            ·    pelvic pain

            ·    acne

            ·    irregular menstrual periods

            ·    infertility

            ·    cysts in the ovaries, hence the name of the disease.

            ·    hirsutism or excess hair where it should not be.

            ·    Skin with spots or discoloration

            ·    High Blood Sugar Level

            ·    Sleep Apnea

            ·    weight gain

            ·    fatigue

            ·    sleep problems

            ·    headaches

            ·    emotional disorders.

Did I forget something? Sure!

        ·    Hair loss or thinning hair, or both.

So unfortunately, PCOS is one of the diseases that cause hair loss. 

The treatment for PCOS is possible, although complicated. But the main treatment consists in taking topical or oral antiandrogens.


If you are suffering of scalp psoriasis, I have good and bad news to share. Which one do you want first? Well, let's start with the good. The good thing is, this condition itself does not cause hair loss. It's also temporary.

The bad news is that, even if you scratch your head to relieve the itching, that can cause you to lose your hair. Psoriasis produces scaling layers and bumps on the skin. or papules, which form plates. At least 50 percent of those with psoriasis develop scales.

Some of those suffering from psoriasis have it because of a genetic predisposition. The affected genes seem to have some control in the body's immune system.

If you try to remove the scales and protrusions by force to feel relief, that will cause hair loss. But if you get an effective treatment against psoriasis, the hair will grow again.

Scalp Diseases and Infections

There are different types of scalp diseases and infections and in one way or the other could affect your hair, but in many cases not directly. Here is a list of the most common scalp diseases in alphabetical order:

            ·    Alopecia Areata

            ·    Bamboo Hair

            ·    Cradle Cap or Seborrheic Eczema

            ·    Cysts

            ·    Dermatitis

            ·    Folliculitis or Scattered Pus Bumps

            ·    Itchy Redness

            ·    Ito Syndrome

            ·    Leishmaniasis

            ·    Lichen Planus

            ·    Lichen Simplex

            ·    Lupus Erythematosus

            ·    Pediculosis Capitis or Head Lice

            ·    Piedra

            ·    Pityriasis Amiantacea

            ·    Pityriasis Capitis or Dandruff

            ·    Psoriasis

            ·    Ringworm

            ·    Seborrheic Dermatitis

            ·    Scleroderma

            ·    Temporal Arteritis

            ·    Tinea Capitis

            ·    Trichodystrophy

As I told before some of these affections of the scalp are not directly linked to hair fall, while others are diseases that cause hair loss.

Scalp DiseaseScalp Disease


According to Mayo Clinic, stress and hair loss are related. This is the first of the diseases in alphabetical order, that cause hair loss.

The loss of hair that comes from stress can occur, either due to a very stressful physical, or emotional event such as a divorce, the death of a loved one, injury, illness, surgery, or even serious financial problems. Click here to know about hair loss from stress.

Trichotillomania or Hair Pulling Disorder

Trichotillomania (TTM), or hair pulling disorder, is a control impulse disorder, characterized by a prolonged desire to pull the hair, either from the head, eyebrows, eyelashes or other body parts where there is body hair.

This happens even if the person who has this condition has tried to stop these impulses. The persons with this disorder knows that they is hurting himself, but simply can't stop. 

Doing that leads to irregular bald spots, which causes anguish and therefore interferes with daily life and with others. Many of those who suffer from Trichotillomania deny it, and try to cover their hair loss by putting on hats, caps, wigs, fake eyelashes and eyebrows.

There are different degrees of Trichotillomania, some milder, others more severe. There are treatments that have helped reduce or even eliminate completely the urge to pull the hair.

So there you have it, the diseases that cause hair loss. This is just a quick view of all these conditions. Click here, if you want to know more about the causes of hair loss. To know what are the full symptoms of each disease and possible treatments, be alert of future complete analysis of each disease.