Excessive and unusual hair loss (losing more than 50-100 strands) of hair everyday
Symptoms - Strands of hair in your hair brush; Hair that is prone to falling off with gentle pulling; Thinning patches
Causes
Hormonal changes due to pregnancy, childbirth or menopause
Medications to treat cancer, etc
Alopecia Areata (an autoimmune disease that attacks hair follicles)
Scalp infections like ringworm
Male-pattern hair loss caused due to genetics
It triggers your body to make many new cells on the skin.
Symptoms
Red scaly patches on scalp; Sharply defined skin patches on the scalp
Itchy but sometimes can be asymptomatic (meaning showing no symptoms)
Bleeding and hair loss in some cases
Causes
Scalp psoriasis is a skin condition that is an autoimmune disorder.
Your immune system works against your own body instead of protecting it.
A fungal infection of the scalp, where it makes circular marks
Symptoms
Itchy patches; Red areas or bald spots
Brittle hair; Slight fever in some cases
Causes
Fungi called dermatophytes cause ringworm. They thrive on the warm and sweaty scalp.
Poor hygiene and sharing combs, beddings etc. used by infected people.
House pets like cats and dogs can spread ringworm
Lice are parasites that live on the human scalp by sucking human blood. They look like the seeds of sesame.
Symptoms
Itchy scalp
Feeling that something is always crawling on the scalp
Sores or redness on the scalp due to scratching
Causes
Head-to-head transmission
Sharing items like combs, hair brushes, hair accessories, towels etc.
Item contact with the head, e.g pillows
An irritated scalp may be a sign of eczema, can take several forms, including atopic dermatitis and contact dermatitis.
Also a condition known as seborrheic dermatitis, is more commonly known as dandruff; For infants known as Cradle cap
Symptoms
flaking skin; redness; scaly patches; swelling
Itchiness; burning
Causes
Atopic dermatitis - presence of too many inflammatory cells in the skin
Contact dermatitis - foreign object or substance causes irritation or an allergic reaction on the skin
Dandruff on the scalp can be noticed with the little white flakes that are nothing but dead skin cells.
Symptoms
White flakes on the scalp that eventually fall off on the shoulders
Itchy, dry and red scalp
Causes
Dry weather conditions
Fungus breading on the oil or sebum
Hair colors
Hair care products that react with your scalp
Occurs when the scalp does not have enough oil for the skin to feel lubricated.
Symptoms
itch and flake
when the skin breaks from cracking or scratching, bacteria can get in and cause an infection
Causes
more common in dry climates,
more likely to happen as you get older.
washing hair too often or use harsh hair products that strip out natural oils.
Folliculitis is an infection or inflammation of the hair follicle. Hair follicle is a pore or opening to the root of your hair..
Symptoms
Small red, white or yellow bumps; Itching; Swelling
Pus; Soreness
Causes
Bacteria called staphylococcus or fungi
Contracting via towels, soaps and clothes
Shaving, waxing or plucking
Weak immune system
Source from https://skinkraft.com/blogs/articles/scalp-conditions