Infertility can cause psychologically distress, emotionally stress and financial difficulties for both partners (3). Typical reactions to infertility include shock, sadness, depression, anger and frustration, loss of self-esteem and self-confidence and a general loss of sense of control (1).

Although infertility is not a life-threatening issue, it is still considered a stressful life experience for couples. The high stress of infertility might be attributed to the fact having a child is considered to be important in general society (2).

Furthermore, infertile couples often conceal their emotions, ideas and beliefs because infertility is still considered to be a private subject. Therefore, infertile couples may be exposed to social pressure. In addition, an individual relationship with their partner as well as that with friends and family members may suffer. These family members or friends may provide meaningful views and suggestions that may cause further distress. Therefore, couples with infertility problems may reduce social interaction, especially with pregnant women and friends who have children (3).

Additionally, infertility may negatively impair an individuals' self-esteem. For example, a study in a Jordanian population aimed to examine the effects of experiences of rural women on infertility (6). In the Jordanian rural sociocultural context, this aforementioned study aimed to investigate reactions to infertility and its implications. The results indicated that female reactions to infertility included submission and docility, self-isolation and internalisation of anger and sadness. In addition, women with infertility were revealed to have a negative perception about themselves and their sexuality (6).

Psychological stress is also perceived as a potential clinical risk factor that may reduce male fertility (7-9). Studies investigating the correlation between male infertility and psychological stress have reported conflicting results (7-12). Some authors have succeeded in demonstrating that an inverse relationship exists between psychological stress and semen parameters (7-11). However, a previous study (12) has reported results that failed to demonstrate this relationship.

More specifically, there are studies that have identified alterations in a number of different sperm parameters in diverse, stressful circumstances, such as in students during exam periods (7), times of war (8,9), periods of elevated stress in their professional career (10) or during mourning (11). However, a study by Hjollund et al (12) contradicted the aforementioned results by indicated that an individual's everyday psychological stress has little effect on semen quality. Moreover, treatment for reducing infertility itself can become a factor that increases stress in men (13). A previous study demonstrated that men from couples who fail to achieve pregnancy despite treatment will experience negative feelings such as frustration and disappointment caused mainly by prolonged efforts in terms of taking medication and expensive treatment costs (13). Furthermore, fertility problems, such as alterations in semen parameters, can lead to other stress-related conditions such as erectile dysfunction and premature and retrograde ejaculation, which can further negatively influence fertility status (9).

In addition to the psychological side effects that may occur from infertility itself, a range of other side effects can be caused by hormones and drugs used to treat infertility. For example, the synthetic oestrogen clomiphene citrate (Clomid, Serophene), which is often prescribed as it improves ovulation and increases sperm production, can trigger anxiety, interruptions of sleep and irritability in women (11). It is important to mention that these side effects have not been reported in men (13). Other medications for infertility may cause issues such as depression, mania, irritability and difficulty in concentrating (14). For example, letrozole, which is an oestrogen receptor blocker, may cause various side effects such as severe headaches, dizziness, fatigue, sleeplessness, breast pain or an abnormal cycle (14). Lupron, which is another drug commonly used in the treatment of infertility, has been indicated to cause mood swings, depression and anxiety symptoms, vaginal dryness, acne, joint pain and decreased sex drive in some women (15). As aforementioned, infertility itself may lead to various psychological side effects. It may be difficult for patients and clinicians to understand which responses are psychological and which are caused by medication (14). Therefore, a classification of these possible side effects is vital (Table I indicates the possible negative side effects of the most popular treatments used for infertility) (14-16).

Few countries worldwide offer insurance coverage for the treatment of infertility (1). The coverage range of the treatment varies, and it is not 100% effective. Therefore, the cost of infertility treatment is very high. For example, the average cost of an in vitro fertilisation (IVF) cycle using fresh embryos is $8,158, with fertility drugs adding $3,000 to $5,000 per cycle (17).

Failure to acquire specialised treatment can lead to feelings of helplessness and desperation for couples who do not have insurance coverage or the means to pay for the therapy (17). Even patients with insurance coverage may discover that they have to large sums of money with co-payments or may experience coverage constraints (17).

Infertility procedures help only ~50% of patients to become parents, with this probability of achieving pregnancy lowering with age (2). Patients who undergo successful IVF procedures may be overjoyed, but new types of emotional and psychological stress are also experienced during pregnancy and after birth. For instance, women who have endured numerous miscarriages can be anxious if they can carry to term. Older couples may discuss whether prenatal tests such as amniocentesis should be undertaken, as this is a common source of stress (18).

It has previously been identified that causes of infertility among men and women are widespread (3,6,16). Causal factors for infertility are not limited to medical factors but extend to psychological variables (19). Women's emotional stress can be indicated as tubal spasms, anovulations, and vaginism (1). In addition, during ovulation, women can unintentionally avoid sexual intercourse (2). Women with infertility have a number of psychological commonalities. Although the majority of women appear to enjoy getting pregnant and verbally expressing their desire, they may conceal adverse opinions and fear of pregnancy (20). These fears may be caused by pregnancy, delivery or maternity. Changing body shape during pregnancy, fear of losing one's life or the child during delivery, or fear of failing as a mother are some of the potential underlying causes of stress (21). A previous study (22) have demonstrated that a more affectionate and unrestricted bond could be created between partners if women were encouraged to communicate feelings, which could subsequently lead to increased chances of pregnancy.

In contrast, impotence with erection and ejaculation can be the root cause of psychological issues, which can lead to infertility among men (1). These issues may arise from birth or may arise later in life. Furthermore, temporary impotence can be experienced at any point in life in the vast majority of men. Most often, impotence is caused by psychological triggers and specifically, previous psychological traumas, eating disorders and overprotective and over-affectionate mothers have been indicated to be among the main psychological variables that may lead to impotence (23,24).

Some differences in traits and disorders have been previously associated with infertility (26). It has also been demonstrated that women with infertility present greater levels of depression compared with infertile men (33). Specifically, depression is reported to be more prevalent among women with infertility, while there is a greater amount of psychosomatic distress among men with infertility (34). In addition, a greater level of experienced stress and a deteriorated quality of life has been indicated among infertile men with elevated alexithymia characteristics (35). On the other hand, women with infertility have revealed cognitive dysfunction and increased anxiety and depression (36,37). Previous studies have indicated that men with infertility score higher on the scales of relationship satisfaction compared with women (38). A possible explanation for these results may be that women feel more responsible and guilty than men during the process of trying to concieve. Furthermore, women with infertility are exposed to greater social pressure and stigma (39,40).

It has been previously demonstrated that insufficient psychological assistance, ineffective therapy, low socioeconomic status and lack of partner assistance are associated with increased chances of developing depression (40). For example, a study showed that an individuals partner and relatives adverse responses regarding infertility was associated with higher levels of anxiety and depression and reduced self-esteem (36).

Regarding other psychological variables that may be associated with infertility, it has been reported that unexplained infertility is associated not only with elevated levels of anxiety but also with high levels of stress (41). Additionally, genetic infertility is indicated to be more associated with depression (42).

Regarding the main factors that are associated with male infertility, stress levels are demonstrated to have a higher impact on male-related infertility issues. For example, in a study, couples were asked to avoid expressing negative feelings regarding male-caused infertility issues. The results of the aforementioned study indicated that not expressing negative feelings regarding men's infertility was positively associated with increased pregnancy ratios (43).

Furthermore, a previous study stated that the period of infertility was more dependent on depression level rather than the duration of treatment (36). These results and associations are important because at the beginning of the therapy, couples may assume they will conceive quickly, and as the duration of infertility increase, depression, anxiety or other psychological disorders may increase. Therefore, in the subsequent section of the present study, the recommended treatments that couples suffering from any type of infertility-related problem could follow are outlined.

Psychotherapy is an important intervention that should be recommended for couples suffering from any form of infertility. Therefore, counselling should ideally begin before patients start any medical intervention to help with infertility (44). As some studies have indicated, addressing psychological problems such as depression, anxiety and stress may help increase the chance of conception (44). In addition, studies have indicated that interpersonal treatment, which focuses on enhancing relationships or resolving disputes with others, and cognitive behavioural therapy, can help patients with infertility with depression and anxiety (45,46). Studies have revealed that psychotherapy can be separately provided with great results to couples or in a community (47,48).

Furthermore, psychotherapy helps boost coping strategies or assist in decision-making during treatment. Additionally, therapy may help patients with various mood or sleep disorders.

In addition to the psychological help that couples who cannot conceive a baby should receive, other complementary interventions should also be advocated. Given that infertility and its therapy often cause significant stress, multiple relaxation techniques are recommended by specialists: Meditation, deep breathing, guided imagery and yoga.

Previous studies have emphasised the effect of yoga on decreasing psychological stress among individuals undergoing infertility treatment (49-51). Specifically, a study demonstrated that yoga intervention increased the quality of life and decreased negative feelings and thoughts that were associated with infertility (50). The aforementioned study revealed that participating in yoga classes also decreased symptoms of anxiety and depression in women undergoing IVF (50). Furthermore, the results of previous studies have demonstrated that structured yoga classes lasting six weeks decreased anxiety by 20% and anxiety scores by 12% (52).