Here are the signs and symptoms of gambling addiction:
• Preoccupation – an obsession with gambling.
• Tolerance –  a need to gamble with increasing amounts of money in order to achieve the desired excitement.
• Withdrawal –  restless or irritation when trying to cut down or stop gambling.
• Escape – gambles as a way of escaping from problems or relieving dysphoric mood (e.g., feelings of helplessness, guilt, anxiety or depression).
• Chasing – after losing money gambling, often comes another day in order to get even ("chasing one's losses"). Chasing is a classical behavior pattern characterizing pathological gambling.
• Lying – lies to family members, therapists or others to conceal the extent of involvement with gambling
• Illegal acts – committing forgery, fraud, theft or embezzlement in order to finance gambling.
• Risked significant relationship – jeopardizing or losing a significant relationship, job, education or career because of gambling.
• Bailout – relying on others to provide money to relieve a desperate financial situation caused by gambling.
• Loss of control – repeated unsuccessful efforts to control, cut back or stop gambling.

What are the social and economic effects of gambling addiction?
• Job loss, unemployment;
• debt, bankruptcy;
• embezzlement, fraud, check forgery;
• eviction, forced home sales;
• crime, arrest, incarceration;
• poor physical and mental health, suicide.

How can I identify gambling addiction in the workplace?
 • Excessive use of telephones (to call bookmakers, stockbrokers or to obtain credit).
 • Taking the company vehicle to the race track, card room, casino, etc. (parking tickets near gambling locations are a "red flag").
• Absences at work, often for part of the day (typically after lunch).
• Arriving late for work (related to all-night card games, casino trips, anxiety-related sleep disturbances).
• Vacation days taken on isolated days rather than in weeks (or vacations taken to gambling locations on a regular basis).
• Failure to take days off (obsessed with getting money to pay gambling debts or afraid to take a day off because of a fear that embezzlement or fraud will be discovered in their absence).
• Changes in productivity (which seem to be related to mood swings).
• Organizing office pools and gambling junkets.
• Borrowing money from co-workers or arguing with co-workers over failure to pay debts.
• Embezzlement, defrauding customers or engaging in employee theft for resale.

Here are main diagnostic criteria of gambling addiction:

• Thinking and preparing for gambling very often;
• Playing just to "win back" lost money;
• Gambling during work or when you are expected at home;
• Using gambling to escape from stress and problems;
• Getting into debt from gambling and lying to borrow money to gamble;
• Using illegal means to finance gambling;
• Loss of control, tolerance;
• Increasing preoccupation;
• Lying about one's gambling.