That's debateable. At the very least, three drinks a day qualifies as "problem drinking".
According to
this site, the theshold for problem drinking is 14 days per week for a man under 65, or 7 drinks per week for a man over 65. However, the number I was taught way back when was 5 drinks per week, regardless of gender or age.
And yes, I realize that this is much lower than the amount that many people drink.
Signs of Alcoholism:
Signs of Alcohol Abuse
The ability to consume a good deal of alcohol without getting intoxicated
A preoccupation with drinking and alcohol
Experiencing blackouts or memory lapses
The use of alcohol to alter ones mood, i.e., to calm the nerves
Binge drinking: episodic, gross over indulgence
Hiding alcohol or sneaking drinks
Drinking before events or social gatherings
Job losses or complaints by employers regarding ones drinking
Relationship or marital problems as a result of too much drinking
Friends, relatives or co-workers complain about problem drinking incidents
Alcohol related arrests: public intoxication, DUI, lewd behavior, altercations
Behavioral changes while intoxicated: anger, sexual promiscuity, rash acts
Feeling remorseful or ashamed of behavior after drinking
Losing friendships or social rejection as a result of ones drinking
Drinking before noon
A decline in self-care or hygiene
Family history of alcohol abuse or alcoholism
Frequent intoxication: drinking two or more days a week
Physical harm as a result of drinking (accidents or fights)
Drinking alone
source
One symptom does not a disease make.