The list that puts all other lists to shame!
Pregnancy effects include the following:
Normal, frequent, expectable and temporary side effects: Exhaustion, altered appetite and sense of taste and smell, nausea and vomiting (50% in first trimester), heartburn, indigestion, constipation, weight gain, dizziness, lightheadedness, bloating, swelling, fluid retention, hemorrhoids, abdominal cramps, yeast infections, congested, bloody nose, acne and mild skin disorders, skin discolouration (chloasma), mild to severe back ache and strain, increased headaches, difficulty sleeping, discomfort while sleeping, increased ruination and incontinence, bleeding gums, pica, breast pain and discharge, joint pain, joint swelling, leg cramps, difficulty sitting, difficulty standing in later pregnancy, inability to take regular medications, shortness of breath, higher blood pressure, hair loss or increased facial / body hair, tendency to anemia, curtailment of activity level, infection including from serious and potentially fatal disease (pregnant people are immune suppressed and are more susceptible to fungal and other diseases), extreme delivery pain, perineum tears ranging from slight to extreme tear to the anus, tears upward to through the clitoris thus making orgasms temporarily or permanently impossible, hormonal mood changes including post partum depression, continued post partum depression exhaustion and recovery period (exacerbated with c sections that can take up to a year recovery)
Normal, expectable or frequent permanent side effects: Stretch marks (worse in younger women), loose skin, permanent wait gain or redistribution, abdominal and vaginal muscle weakness, pelvic floor disorder, changes to breasts, increased foot size, varicose veins, scarring from episiotomy or c section, other permanent aesthetic changes to body, increased proclivity for hemorrhoids, loss of dental and bone calcium (cavities or osteoporosis or teeth loss), higher risk of Alzheimer’s Occasional complications and side effects: Complications of episiotomy, spousal/partner abuse, hyperemesis gravidarum, temporary and permanent injury to back, severe scarring later requiring surgery especially after multiple pregnancies, prolapsed uterus, pre eclampsia, eclampsia, gestational diabetes, placenta previa, anemia, thrombocytopenia
Normal, frequent, or expectable temporary side effects: Severe cramping, embolism, medical disability requiring full bed rest, diastasis recti (torn abdominal muscles), serious infection and disease (e.g. increased risk of tuberculosis), hormonal imbalance, ectopic pregnancy, broken bones, hemorrhage and other complications of delivery, organ failure, refractory gastroesophageal reflux disease, aggravation of pre pregnancy diseases and conditions (e.g. epilepsy), severe post partum depression and psychosis, ptsd, higher risk of ovarian cancer with fertility treatments, lower breast cancer survival rates, higher risk of coronary and cardiovascular disease (6+ pregnancies)
Less common but serious complications: Peripartum cardiomyopathy, cardiopulmonary arrest, magnesium toxicity, severe hypoxemia/acidosis, massive embolism, increased intracranial pressure, molar pregnancy, gestational trophoblastic disease (like a pregnancy induced cancer), malignant arrhythmia, circulatory collapse, placental abruption, obstetric fistula
More permanent, severe side effects: Permanent blindness as a complication of pregnancy induced hypertension, Future infertility, permanent disability, death
Some math regarding the risks involved with pregnancy: Risk of C-section (major abdominal surgery - significant harm) - 15% Risk of 3rd/4th degree perineal tearing (tearing causing damage to vagina, anal sphincter, requiring significant stitches and/or surgery - significant harm) ~3-5% Risk of death - 0.0174% Risk of pre-eclampsia (requires ICU hospitalization, can develop into eclampsia which is even more dangerous) - 6.45% For people with pre-eclampsia, the risk of stroke is 0.171%, the risk of pulmonary edema/heart failure is 0.562%, the risk of renal failure is 1.36%, and the risk of death is 1.2%. This is an extremely brief and far from exhaustive list of possible complications of pregnancy as mentioned above. And this is all for pregnancies without prior conditions that can increase the risk of many complications.
Source: https://www.reddit.com/r/childfree/comments/17nlyza/please_remind_me_why_i_dont_want_to_have_children/