A Question of Health

WHY DO contraceptive pills come in packets of 21?

The men who invented the contraceptive pill decided women liked seeing a period every month. So they produced a system that induces a bleed every 28 days. Bleeding that occurs when you take the pill is artificially induced by hormones - it is not a true menstrual bleed. The pill could easily have come in packets of 35, which would produce a period every six weeks, or 65, which would cause bleeding every nine weeks.

Some women take three packets consecutively, followed by a one-week break, and this means they get only four periods a year. This system of "tri- cycling" is effective and causes no harm.

MY MOTHER had an underactive thyroid gland and I think I may be developing the same thing. What symptoms should I look out for?

Weight gain, constipation, dry skin, hair loss, feeling cold, puffiness around the eyes, depression, general tiredness and slowing down. But if the thyroid gland is not producing sufficient hormones, it usually begins slowly and insidiously, with vague symptoms of tiredness. Women are affected by hypothyroidism much more than men, and thyroid problems, both underactive and overactive, often run in families. Sadly, most people who are overweight, myself included, do not have underactive thyroid glands.

MY FOUR-month-old son has had a sticky eye since he was born. Can anything be done about it?

Your son has a blocked tear duct, the tiny channel that drains tears away from the eye. It's quite a common problem. The good news is that the duct almost always opens up without any intervention from doctors. Just keep the eye clean with cotton wool and clean water.

HOW MUCH effect does diet have on cholesterol levels?

Most people can reduce raised cholesterol levels by up to 10 per cent by cutting down on their intake of fat.Drugs known as statins can reduce cholesterol levels more effectively than dietary changes, with hardly any side-effects. Although cholesterol causes heart disease, it has to be seen as part of a wider picture, including smoking, exercise, blood pressure, obesity and genetic factors.

Please send questions to A Question of Health, The Independent, 1 Canada Square, Canary Wharf, London E14 5DL; fax 0171-293 2182; or e-mail to health@independent.co.uk

PROMOTED VIDEO
Have you tried new the Independent Digital Edition apps?
Arts and Entertainment
Robin Thicke's video for 'Blurred Lines' has been criticised for condoning rape

Robin Thicke admits he didn't write 'Blurred Lines'

music
Arts and Entertainment
While many films were released, few managed to match the success of James Bond blockbuster 'Skyfall'

film
Arts and Entertainment
Matt Damon as Jason Bourne in The Bourne Ultimatum (2007)

film
Arts and Entertainment
Sheridan Smith as Cilla Black

Review: Cilla, ITV TV
Arts and Entertainment

TV
Arts and Entertainment
Tom Hardy stars with Cillian Murphy in Peaky Blinders II

TV
Arts and Entertainment

art
Arts and Entertainment
Keira Knightley and Benedict Cumberbatch star in the Alan Turing biopic The Imitation Game

film
Arts and Entertainment
Kanye West is on his 'Yeezus' tour at the moment

Music
Arts and Entertainment
Rob James-Collier, who plays under-butler Thomas Barrow, admitted to suffering sleepless nights over the Series 5 script

TV
Arts and Entertainment
Bradley Cooper and Jennifer Lawrence star in new film 'Serena'

film
Arts and Entertainment
Some might argue that a fleeting moment in the actor’s scintillating, silver-tongued company is worth every penny.

TV
Arts and Entertainment
Colin Firth stars as master magician Stanley Crawford in Woody Allen's 'Magic in the Moonlight'

film
Arts and Entertainment
U2 have released Songs of Innocence in partnership with Apple

musicBand have offered new record for free on iTunes
Arts and Entertainment
Brad Pitt stars in David Ayer's World War II drama Fury

film
Arts and Entertainment
Top hat: Pharrell Williams

music
Arts and Entertainment
Jonah Hill and Channing Tatum star as undercover cops in 22 Jump Street

film
Arts and Entertainment
David Bowie is back with fresh music after last year's hit album The Next Day

music
Arts and Entertainment
Keith Richards is publishing 'Gus and Me: The Story of My Granddad and My First Guitar', a children's book about his introduction to music

music
Arts and Entertainment
Calvin Harris has generated £4m in royalties from the music platform

music
Have you tried new the Independent Digital Edition apps?

ES Rentals

    Independent Dating
    and  

    By clicking 'Search' you
    are agreeing to our
    Terms of Use.

    Mystery of the Ground Zero wedding photo

    A shot in the dark

    Mystery of the wedding photo from Ground Zero
    His life, the universe and everything

    His life, the universe and everything

    New biography sheds light on comic genius of Douglas Adams
    Save us from small screen superheroes

    Save us from small screen superheroes

    Shows like Agents of S.H.I.E.L.D are little more than marketing tools
    Reach for the skies

    Reach for the skies

    From pools to football pitches, rooftop living is looking up
    These are the 12 best hotel spas in the UK

    12 best hotel spas in the UK

    Some hotels go all out on facilities; others stand out for the sheer quality of treatments
    These Iranian-controlled Shia militias used to specialise in killing American soldiers. Now they are fighting Isis, backed up by US airstrikes

    Widespread fear of Isis is producing strange bedfellows

    Iranian-controlled Shia militias that used to kill American soldiers are now fighting Isis, helped by US airstrikes
    Topshop goes part Athena poster, part last spring Prada

    Topshop goes part Athena poster, part last spring Prada

    Shoppers don't come to Topshop for the unique
    How to make a Lego masterpiece

    How to make a Lego masterpiece

    Toy breaks out of the nursery and heads for the gallery
    Meet the ‘Endies’ – city dwellers who are too poor to have fun

    Meet the ‘Endies’ – city dwellers who are too poor to have fun

    Urbanites are cursed with an acronym pointing to Employed but No Disposable Income or Savings
    Paisley’s decision to make peace with IRA enemies might remind the Arabs of Sadat

    Ian Paisley’s decision to make peace with his IRA enemies

    His Save Ulster from Sodomy campaign would surely have been supported by many a Sunni imam
    'She was a singer, a superstar, an addict, but to me, her mother, she is simply Amy'

    'She was a singer, a superstar, an addict, but to me, her mother, she is simply Amy'

    Exclusive extract from Janis Winehouse's poignant new memoir
    Is this the role to win Cumberbatch an Oscar?

    Is this the role to win Cumberbatch an Oscar?

    The Imitation Game, film review
    England and Roy Hodgson take a joint step towards redemption in Basel

    England and Hodgson take a joint step towards redemption

    Welbeck double puts England on the road to Euro 2016
    Relatives fight over Vivian Maier’s rare photos

    Relatives fight over Vivian Maier’s rare photos

    Pictures removed from public view as courts decide ownership
    ‘Fashion has to be fun. It’s a big business, not a cure for cancer’

    ‘Fashion has to be fun. It’s a big business, not a cure for cancer’

    Donatella Versace at New York Fashion Week