Some of our most minor personal habits, like how we keep our fingernails trimmed, our finger length, or even the natural shape of our fingernails, can reveal more than you might guess. Indeed, these trait reveal much about our unique, individual personality traits. In this article, we will look at some of the reasons our fingernails can reveal our inner personality and what our fingernails say about us.

What Do Your Fingernails Reveal About Your Personality?

In grade school, it used to be a joke that you would ask someone to look at their fingernails. If they turned their hand with their fingernails pointing toward themselves with their hand curled, it meant they were feminine. But if they looked at their hand with their nails pointing toward the other person, it meant they were masculine. Boys tried to catch girls doing this the ‘wrong’ way for their gender and vice versa and then used that as another reason to tease. Unacceptable bullying and nonsense aside, it turns out that fingers may have more in common with our masculinity or femininity than you might think.

Let’s research finger length, fingernail shape, and what it means for our personalities.


Finger length and masculine or feminine personality traits

Research by the Department of Psychology at the University of Alberta, Canada, studied finger length in men and its correlation to mood. The researchers say that there is an apparent reason for finger length being studied because ‘Finger length ratio (index to ring finger) is a sexually dimorphic trait found in various species ranging from humans and mice to zebra finches.’

The research shows that, on average, males have a relatively shorter index finger compared to their ring than females do. The theory is that the finger length ratios of the index finger and ring fingers are related to the amount of estrogen or testosterone that a baby receives in the womb during development.

The Canadian study also revealed a connection between depression in men and the length of their fingers. They found that a more ‘feminine’ ratio of finger length was related to depression in men. Other studies have found a connection between a shorter index finger in men and ADHD symptoms, alcohol dependency, autism, aggressiveness, leadership, a tendency to be a psychopath, and other traits.

For women, a shorter index finger indicates an increased risk of anorexia and assertiveness. A more extended ring finger than an index finger for women indicates elevated bulimia risk, neurotic behavior, psychopathic behavior, visual memory, and verbal skills.


What your fingernail shape reveals about your personality

A study from the Dermatology Division of the Department of Medicine at the University College Hospital in Ibadan, Nigeria, says the following about fingernail shapes and personality traits:

  • Fan-shaped or Triangle shaped with the point down (wider at the tip). Fan-shaped nails with a narrow base that widens towards the top of the finger (like a fan) may reveal an anxious or high-strung personality.
  • Almond or Triangle point up (wider at base). Fingernails that are wide at the base and narrower at the tip might indicate a gentle, creative, more refined, and emotionally sensitive personality.
  • Broad rectangle. A fingernail that is wider than it is long is associated with a short temper. These broad and square fingernails reveal an ‘easy going, calm, honest, patient, upright, balanced and broad-minded person.’
  • Tall rectangle. Long fingernails could mean the character will be prone to selfishness and narrow-mindedness.
  • Square. Square fingernails are relatively equal in length and width. People with square fingernails reveal a person who can be ‘tight-fisted, mean, and stingy.’ This shape of fingernails also reveals a tendency towards impatience and quick thinking, and the shorter the fingernails, the more critical the personality.
  • Oval or round. This shape tends to be the most positive, open-minded, and happy. A rounded fingernail shape is creative, independent, and a quick learner.
  • C-shaped curving down. This fingernail shape indicates a personality that is hard working and has had to overcome an obstacle in the past. This fingernail shape reveals a person who is perseverant and courageous.

Anatomy of our nails

What we call our fingernail is anatomically the nail plate. The nail plate is made of the protein keratin produced by the nail matrix near the cuticle of the fingernail.

The part of the fingernail attached to the nail bed is pink because we can see the blood vessels of the nail bed. The free edge of the fingernail is white in color as the fingernail grows beyond the nail plate.

According to Bianca Maria Piraccini, author of Nail Disorders: A Practical Guide to Diagnosis and Management, on average, fingernails grow about three millimeters per month. Nail growth slows as we age and is fastest in early adulthood.

Fingernails and personality disorders

Excessive filing, biting, or picking at your fingernails can cause hand health problems. Often, these behaviors may be an outlet for extreme stress for a person. Nail-biting is a habit that children often outgrow by their early adulthood. So continuing to chew your nails may be a sign that anxiety or stress is becoming overwhelming to you.  In extreme cases, nail-biting can become an obsessive-compulsive personality disorder. In fact, thoughts of nail-biting and needing to chew them interfere with daily activities or result in a negative mood.