Ptosis or sagging of the female breast is a natural consequence of aging. The rate at which a womans breasts drop and the degree of ptosis depends on many factors. The key factors influencing breast ptosis over a womans lifetime are cigarette smoking, her number of pregnancies, higher body mass index, larger bra cup size, and significant weight change. Post-menopausal women or people with collagen deficiencies (such as Ehlers-Danlos) may experience increased ptosis due to a loss of skin elasticity. Many women and medical professionals mistakenly believe that breastfeeding increases sagging. It is also commonly believed that the breast itself offers insufficient support and that wearing a bra prevents sagging, which has not been found to be true.Plastic surgeons categorize the degree of ptosis by evaluating the position of the nipple relative to the infra-mammary fold, the point at which the underside of the breasts attach to the chest wall. In the most advanced stage, the nipples are below the fold and point toward the ground. Signs and symptoms
A womans breasts change in size, volume, and position on her chest throughout her life. In young women with large breasts, sagging may occur early in life due to the effects of gravity. It may be primarily caused by the volume and weight of the breasts which are disproportionate to her body size. Impact of pregnancy
During pregnancy, the ovaries and the placenta produce estrogen and progesterone. These hormones stimulate the 15 to 20 lobes of the milk-secreting glands in the breasts to develop.
Such practice is known as content spamming and is used to attract search engines. An article published in 1897 in American Journal of Psychology noted "the absurd tendency to give Greek names to objects feared (which, as Arndt says, would give us such terms as klopsophobia – fear of thieves, triakaidekaphobia – fear of the number 13....)". Psychological conditions
Specialists may prefer to avoid the suffix -phobia and use more descriptive terms such as personality disorders, anxiety disorders, and avoidant personality disorder. Terms should strictly have a Greek prefix although many are irregularly formed with Latin or even English prefixes. Many use inaccurate or imprecise prefixes, such as aerophobia (fear of air) for fear of flying. A
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Cultural prejudices and discrimination
Ethnic prejudices and discrimination
The suffix -phobia is used to coin terms that denote a particular anti-ethnic or anti-demographic sentiment, such as Americanophobia, Europhobia, Francophobia, Hispanophobia, and Indophobia. Often a synonym with the prefix "anti-" already exists (e.g. Polonophobia vs. anti-Polonism). Anti-religious sentiments are expressed in terms such as Christianophobia and Islamophobia. Medical conditions
Cultural phenomena
-phobia in the natural sciences
In the natural sciences, words with the suffix -phobia/-phobic generally describe a predisposition for avoidance and/or exclusion. For antonyms, see here

Jocular and fictional phobias
Aibohphobia – a humorous term for the fear of palindromes, which is a palindrome itself. The term is a piece of computer humor entered into the 1981 The Devils DP Dictionary. Anatidaephobia – the fictional fear that one is being watched by a duck.